Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b6ad3e737a5098…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 03:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ad72df3bbfe3ce88e2556a1d93981ee SHA-1: e28a21dafb099614addc4bdbe28522655bf1b2a4 SHA-256: a0b6ad3e737a509866b85b348bb4510fa2e02b54b474961e93b0b9dc97b5121d
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 websites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or leading to further compromise. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dieta-plus.pl/userfiles/file/45210289610.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161434207278b8---52191927980.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/jokavijipalimidatikirav.pdfIn PDF document text
    • http://tdbm.vn/upload/files/fekedet.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/62950224563.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/57341966970.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/gifofesirurexamedi.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/jomogugafuxiluf.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/slmq0hqtlcdqcu0ubgpk2fboh2/luruzenajisugewan.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/gozovokurali.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/84306191772.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109241553566365.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/36897657041.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/33712531695.pdfIn PDF document text
    • https://noddy.nu/images/file/vorotufijaxazovuv.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xipatigejupu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/32816115989.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/50402734853.pdfIn PDF document text
    • https://blv.by/upload/editor/files/vavuwisegeridinova.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f60d494d9fb9f68db7275c2cc9a2670a/89190688338.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/89481844659.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kalarumixumesikugabe.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/lideju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pogil+answer+keyPDF 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_off0000ba58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 17452 bytes
SHA-256: 3a53356a8e254255845affc15b2bd1be9abbaebab52d8b73b3003e2bae63de2c
font_02_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10476 bytes
SHA-256: 972e8c2ad5287371c9d3a06bb13684923f512d856d1410944acb21cdd3d4863d