Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0b07834a0ec388…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 21:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63e1ed64d3ff647b57bc60497e8ee856 SHA-1: dbc162bff49715e4f02a6c496977d4d045797e77 SHA-256: cf0b07834a0ec38824a448e637bd6ebf5180ce0f1aeddffab40d0458f5431c4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the document's primary function is to act as a lure for external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=minimum+wage+in+each+state PDF link annotation
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/e30e915d23adc9401b4bf544c0247adf/gexolodupizimuvopodafiw.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/18640207456.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/609095326.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zafekage.pdfIn PDF document text
    • http://emannsltd.com/userfiles/mujop.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/42017333587.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/c0ac4dc719b29b0105a3bc8e351fab6d/sevidojawutubejoxugafoben.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f89787e1---22867516898.pdfPDF link annotation
    • http://kripasec.com/userfiles/file/banefipu.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/12053071617.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/jaluzejekowedajusasesefof.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/baremuropafalisuzaladaj.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/83cc2a418e42b22f36d191dce77c24f2/8727450276.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/dawererigipuzig.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///6277505075.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f00aeca2---11128515902.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/78048305159.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ea0663ed325fdc132ebfe21f7130fe0a/zilozamo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c849c1a6---dufuvawer.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa53357479---penusumuwuz.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/92198234752.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086597489fca---kigaburukenosowi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a467df3ae3---58801290794.pdfIn PDF document text
    • http://axwelindia.com/uploads/kolovububiwulivoxasodu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/relati.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_off0000fb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4F 18008 bytes
SHA-256: 7cdd44599e3942ab36e273fab6eb926e272cabfd0934a3b79e24f9e7d215b413
font_01_sfnt_off00012a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14278 10588 bytes
SHA-256: ccbbdff8ddcd63145884efe45015dbad32d548758e9ee04306e558e4b3a85ac1

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