Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c6eb71d31e640…

MALICIOUS

PDF

75.7 KB Created: 2021-07-17 19:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d72cb6fac629ec4f508a6a3a737e02aa SHA-1: 5925d41791163e8a8589c61d2cf2c4b8e2a6e2e8 SHA-256: a50c6eb71d31e6402ca1931882da942adbe0d99695c9cbdef89ab09cce3ffe1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdf In PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-11/20210511191058802364.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbf2fc30d7---67796457755.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2f81e780a1fd92b99d29743206981316/32536829799.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/rofepur.pdfIn PDF document text
    • https://ms01bet.net/contents//files/legunoleseferaf.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e20a8140731---kevijogesapowogu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c970098661a---balirumewu.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/jelezuzikusizezaxog.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/93044239437.pdfIn PDF document text
    • https://globportal.com/upload/userfiles/files/98228451504.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90cd002396b40690de971c5c846ce18e/joniximi.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/dogaxatajujotuz.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v3471ksj6jmsmla0p2hj60ps03/disoweg.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/710b9596ea8cd7a0ba0eacc44b660d8a/74758445776.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/3296342329.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6dd817f28---29903000941.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6363807e---xufokumarovegibanigapa.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/64069192937.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160973ccae5459---degenaxiletavo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b4416445---16042426118.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/91542690839.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a5210f6b4---70807580596.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/86664161813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=operations+research+applications+and+algorithms+4th+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 15548 bytes
SHA-256: 27c77dc62bcd608a00dad17068b51b63e9f0a293b322fe20b4828269c0b6ec4d
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 11172 bytes
SHA-256: 73a6c5ae234977a8a146c74172664fa6bfa19e81d14c16ce0a876b6b7a4b6f53
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 2812 bytes
SHA-256: 371def6747c6722421f89ed38ac8bb3531332b24edbc2aa4c3b4c5e62be79438

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