Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67867b117a1c177…

MALICIOUS

PDF

87.7 KB Created: 2021-07-15 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a43ff18720e30b112f719f64d9e80fb4 SHA-1: 6e00668068bf5044c50bfffb9d629a6396995398 SHA-256: f67867b117a1c177b97666b5081017907c042811fea9cfb757f41346c73dfa7c
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=bible+reading+tracker+printable+free PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc1778cd7---temuvugisiwixoraxazobarix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c0a8sfmb5hbeub9spr6m448s1c/ligakagifibo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/15392063073.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/et5a7dcdsl7a8otv8o0o4b3fms/21107119100.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/redukoxufebowaka.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/64161132926.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf64c9b5e0---tedujodotaje.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/81960511573.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609869e96010f---91681279726.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/rimozapogikafafewazimalu.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/71263108242.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edb7aca7---87156338552.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cndi3smqp3b6oss333jkovvch8/8943013612.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/voguke.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hcq2u5jdfpnrqf7q06459v0mk9/22089311748.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/paxakudezot.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715f9e318bf---40223388580.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/446d4a3400eaa3d870ff48a338b258d8/13026862677.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d5586ac3---67407217599.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/valumemimapotemago.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pujido.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/a2jnj3qg6l1h1gpm8a0f0qg7bt/19639012636.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 10792 bytes
SHA-256: 974224b3f2c94711437d20bcf157b187227608c4884e102f49f2657305689978
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 17144 bytes
SHA-256: d331e7ff0df945e88e509ccff65cd96678df74f5f400c8e4218a3a9d9c19fa20
font_02_sfnt_off00013975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1