Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac01064771515b7e…

MALICIOUS

PDF

73.3 KB Created: 2021-06-20 21:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f960a71ce3c0b4e3d73991951a92cb61 SHA-1: 6f98c89f5abe8892e61e1f4960ce6821571196b5 SHA-256: ac01064771515b7ee6ebdf631519bceeb9a7b7b9084cd594b89d8c1aca473542
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ajwatravel.com/wheelmarine/userfiles/file/tunuzijujomufogasudenura.pdf In PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/vijurolokozitepaj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e043bbc1---dilopulivumirunolusakazus.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/88411421904.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/75688912774.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/99693629168.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8qqbnvk92f19i1poa60d1921k4/vumojonop.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a0aee88a---nomowipolugevanofa.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210605_56F89725FE218E7B.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5a4d0f1eb4fd5e5e9d12163439794e3d/89740867777.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2c8b6jipq6r0odkpbofunfe8k0/gokugenosid.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160828f6cd1e04---7918089236.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/buvejupuzoxeduf.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d3018301---28702778008.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62e961990---92371115519.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/49135313760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=peter+atkins+physical+chemistry+11th+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://scripts.sil.org/OFLIn 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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 5400 bytes
SHA-256: 4717db1c46c732d9c3a77e098e42f4c331dc7c77a7b522e8982e2e0d474700eb
font_01_sfnt_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 11276 bytes
SHA-256: 9f0ea03b290d72f6f5c0991745ad63dffa958db04421379109637b8b68cf9ce4
font_02_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 16084 bytes
SHA-256: 3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848
font_03_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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