Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb001ef813257eb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 04:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6892483da7c429d8b396f1c364e08958 SHA-1: a7eaa9c6ccec48980ec8b85ec93589ca0f8e7729 SHA-256: cbb001ef813257eb4f500a9dbf325e1b1ab858b2dd1fc3cb69fff94a0c81827d
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures, but the heuristic findings suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soalmatematik.com/userfiles/file/28531044365.pdf In PDF document text
    • https://ecoretras.com/file/65193265441.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/rukutiluxakoxuxupubakije.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/89560878004.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fujozokiwewunixidesiv.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/wudozawiwuwol.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ecu2cc4fn4jshujfrhi3lraq90/jafewefokigu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/19434175162.pdfIn PDF document text
    • http://haki.vn/uploads/files/nofuteretevu.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/riwasoxonoverotosufebifus.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62375248401.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/varurunetod.pdfIn PDF document text
    • http://apvn.info/userfiles/file/togemurikazaw.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081354a276f9---88803104387.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f16b3ddb437533f8cde2b8f5601357b/23056305225.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c608092d8678f858436ebc8eef0ca41a/lugogakevigusenimak.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcf26c5c30---pajow.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/wevatufawerusosavokesofo.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/sobodovamikaluju.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/62694674878.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/getedakana.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e581c0950fe3cfbd1c561a7bb0e201cf/jutirinajipi.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/molafixadaxama.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c961d6687f---43699402950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=technical+drawing+text+book+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 11112 bytes
SHA-256: 2a8ae3e3ef5bbd2eb322d5fa792533ff58b3333a16e059b88bb7b4047c95f5e2
font_01_sfnt_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 17908 bytes
SHA-256: d678317ad108de0ee30e78d7f0e645d66d3c499aede26120ae6e36be66a3c25a
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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