Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4100b23b7220d8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 15:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c6aa48b32e166760c0fc342910e459b SHA-1: fa7161df8fe887c9121453eebdc29d598cbf1aa7 SHA-256: 3c4100b23b7220d80a022af5ae596ad9b6cc9974e9477adf5b3b2f423dd9765d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=sales+supervisor+resume+pdf PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/96930793928.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/10586604794.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/todokok.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/konebumefovipobotepatigu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/50136745849.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b19106337---fosopoxofilitubub.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5dfc96bc250c4dd2e258f92bf0a747d4/fupizobudurexo.pdfIn PDF document text
    • https://linardi.ru/files/file/jevotuw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dfcffb8fc69---rerejofixigal.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/152b29d777393a99f684e3bfe85e8821/muxefitun.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099284473c3b---dafifal.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/zopoliviwudabebirefowoza.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801c4b3be38---kilaletavagipikoseforor.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/danar.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95408dc52---18083257264.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759c2741db---98934645112.pdfIn PDF document text
    • http://aweibel.com/Photo/file/34767296098.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/84430401036.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/maximumelofoxaxezufipar.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/27123086821.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f12c16e6---lidezuxexawarir.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/68388840777.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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10700 bytes
SHA-256: 8daac347376c9363028e8ff5a406d21f8edf6831fc4f4833148171326c2d81f1
font_02_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 18252 bytes
SHA-256: ba80e247d37db667f0d4aee947f05a38a7d82b40138132a8ce7c61f0e763d658

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