Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab206976c1fc9a9…

MALICIOUS

PDF

102.4 KB Created: 2021-07-03 03:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52f1ea8180e524c0352c9d923a48727a SHA-1: f4f29d926b383577b8d4d75c90da399929f7ce51 SHA-256: 4ab206976c1fc9a9e1321bf860fe407bac1c895efea9579912202d5c62eb5257
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links. The presence of numerous external links, some pointing to potentially compromised sites, indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://advance-pack.com/editor_upload/file/dadida.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/76274124954.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/wabidew.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/98b370903fe8bd2d233e746d2470cdbb/44703424595.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/70133944503.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cedeffea320423d367b7e0b6fa481042/57020079460.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/617d437b76fbe956ff93a7513303c9b5/sopelukojurodoguxun.pdfIn PDF document text
    • https://ckmandarin.com/uploads/dokob.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5fc6c496---kemirinakefewusefudiv.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/jibakamoragivunavuzisum.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rllhkllh4g2l2gl3urmgimcniu/68846130529.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kr9p6r657n6kk4v867hgltn283/fipofaguzikanek.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f66139581b---bovakelizoxewivaliniwo.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/diguladetedanuxozej.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/kokenavekagesutose.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/nevabexunav.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5bedee5a6bac2b96c83268881620b5d7/55129298163.pdfIn PDF document text
    • https://silga.ca/userfiles/file/86962838834.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a981c36eb---70535842420.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1920e9c6---gimowekibipuluwonazivumed.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/609bee18a278629bb3f23f0061db5c82/zuwejugapibejone.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/giwitubozumesuxazum.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/51041099030.pdfIn PDF document text
    • http://jarosi.hu/files/file/600135562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=disregard+meaning+in+tamilPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/55008115337.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016b3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16B3C 19028 bytes
SHA-256: 80939e3615e7fc291a112474f8bdb10779a0318aefe15c944f43b34740ba9404
font_00_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 26880 bytes
SHA-256: e5125eae88795edf942f03e05b8b0cdb54e28ecc2684967efbd982835d711196
font_01_sfnt_off00012e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001463f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463F 10472 bytes
SHA-256: 73766fdaee3901a0ac14440e6a09ddddcef53fb6c73e81b0e22a8d8b55972655
font_03_sfnt_off00015dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC2 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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