Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c2fa91d2d39c19…

MALICIOUS

PDF

125.5 KB Created: 2021-07-05 19:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45e4dd42255516e5f6fce003495dae57 SHA-1: aeb0c78edc4616ca687cd3a02b79b514bd7884de SHA-256: 73c2fa91d2d39c198050f5041c32127b60a7e51688b9fbd43f066f1eb46084b4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206adb2404---46939527309.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cdff2f6cb2c---67650505389.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/lisizuruwo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/74a759054cc39d20ef677cccadddb5c9/83415520342.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e4cee0e0---59174550660.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78e1054b6d3a861ffdb238a715a2f78c/93499769285.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ktaahhfv5ni3oand3f478isie3/nimaxalarawobifakawa.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3heqqb0cmrrit2m3ohg5mtssf4/tubevis.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7vid9ibpdc2cg6j1nkdd45hg7p/liwipefelibimurinazuxanu.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/77479421527.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfcfe2c4b---bidatizataxotajedop.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210704_32D6236339A164CD.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607332032e865---xiridafefazin.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/17358220157.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/88117835545.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae70728a5b---55143858376.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5594484741d8298310535cf03b459e4d/98445906562.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kiganudaduxatebiz.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1427689afb---vesetubuvidajo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/pifetamatupokawewufu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/32150414797.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e6f985f9500634c2de4f64938c4a6b31/pusosakixonigakiru.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/pumerojamaroxurilada.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/52973504407.pdfIn PDF document text
    • http://sciattella.net/images/file/54912711321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=proof+is+in+the+puddinPDF 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_006_off0001b235.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B235 27364 bytes
SHA-256: 8cbca5e7157370b68f9a5787455686e3e6e14d6509096333637bca9607ddf33c
font_00_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 8104 bytes
SHA-256: 7ad72158e950b6760e7e45819f4576757069ff4d0023980c395682c428a49d20
font_01_sfnt_off00013b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153AA 10488 bytes
SHA-256: 6e7eb0a26539ea9bf89add2d888574177ab5899c15db5040f69cace3b01a1c40
font_03_sfnt_off00016b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B64 29612 bytes
SHA-256: b8cf228caa736654c62c6c64b3649dee63cda0acdf2a7051a14a3aa726332855

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