Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb948adb043c8557…

MALICIOUS

PDF

183.3 KB Created: 2021-06-28 09:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4b7637514ed631edd9b2892e0298c6e2 SHA-1: 4ebe1ea0b8a7dcbf2d27c7d7d6bb67644bca0980 SHA-256: cb948adb043c8557f1838fb6a6a06f8b268bbe6b7a6408b846a48161b9ef841f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4b7c0d8c---9159362099.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1e2b0f89433a107a43372b7aca5708f3/26270765956.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/katesofeneletovisuvapa.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/nazelapufum.pdfIn PDF document text
    • https://hgb.se/filer/file/nukusaton.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/fowumewisosudirujal.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf10682ed---rabozas.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e361b5c3038c77ce39b72f860c344c66/90033416276.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/bdae9dec13e5dc4e2b768136d1cb5ad8/83312647838.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/cacef6c59778fcedce54b9be622fd7db/98650569394.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fbfa775cdb92b3f537ee533fa964cb41/botejofisodoga.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/manedopokabejanupuxodeb.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rg13m8ln7cf2v99gi1k1gie985/15611323293.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/divuxafixukodopir.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/f2b558c03649c5cef1b67a665aa3ff00/vileliridulepawuzusu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/nugisatapiputogujetojonef.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/ada803a0bb5a41c7c60145b4ae86e9f7/52805649898.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4da8903c33747c0b131156eda2cd883c/padusazifopedivotaperiza.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/37357494913.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/43958465139.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609143b73eb32---8923893678.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/98986119956.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18a04347e---todumigenaxiwubova.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e45d9fab5cede5a3b904203df8c98441/wapirerapisufesiz.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n1dpf6radpfuluj4nq6a7rs3qh/maxugiweb.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff0d713ea---woxizurojoxux.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/57259196411fb59127200bc2132da1c3/16512231464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=talking+freely+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001bbd8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BBD8 34364 bytes
SHA-256: 9f1839020c2adb4ea96645d624842b8af69842cfe6bd4cff4d6351e2941e1729
font_01_sfnt_off0001fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000214ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214AC 10340 bytes
SHA-256: 1227ccba99d58d369b937222148a775eb61a4a2d2e972c75487d588ebb38bb42
font_03_sfnt_off00022bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BEE 38388 bytes
SHA-256: 9b31bd1b08aedd6ca857e3eca08c3dcbdd85efd0aec2eaf84196ee4929912d6f
font_04_sfnt_off00027f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F20 27876 bytes
SHA-256: 4fa4b4e69518501c315251493ed67f900b5a633f69c1f4928adae72efd952628

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