Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcc02b2554608f4…

MALICIOUS

PDF

91.5 KB Created: 2021-06-17 15:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e03ff083fb5633fbfc3386185430ed32 SHA-1: 3a6292d77663dfbd51234f14716112c442d333a8 SHA-256: ffcc02b2554608f4d1b014465e1e3a98df0681e163c7e7650fa28054fba2dc01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure disguised as a CV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=personal+cv+format PDF link annotation
    • http://jinistudy.com/_UploadFile/Images/file/26372267552.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/dasasusavumitimezevoxix.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/47277194687.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1621a22e2---70770281557.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/tufisedijamepike.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wixevutatarenupogabikode.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/20510303200.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/nu829dnau5sniih88l4lg01dgh/50179417999.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/99430058575.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f33500ccc6---55666127656.pdfIn PDF document text
    • http://brlairport.com/images/file/kevuxuwabaliwix.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b8832460bcc3dcb16bdc77a1c7091b41/46811386130.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f8cb839---16478661407.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/726c4466124403f69d48fc5e34a607b3/52337267873.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829811bfac9---47290877123.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/134a825d582e137e6b42e35f884a50ed/galokukorivuwuxib.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/58755141054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 5088 bytes
SHA-256: 50af73de55420d3e30f686c8961e6b517c0247b62f780f8592dfd5a84fc4ab6a
font_01_sfnt_off00013aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEC 11392 bytes
SHA-256: 969d3aa6a3e181f29c3152ed6863b194451400dfddd3e3f58d15026b07d9008d