Malicious PDF — malware analysis report

Static analysis result for SHA-256 4382a0f351a407dc…

MALICIOUS

PDF

92.4 KB Created: 2021-09-06 12:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db538e4aa90f01d0b03325f3a8703ad3 SHA-1: fafe1078627ae3cc99aafc10914da2d50efa2688 SHA-256: 4382a0f351a407dc74e5e2abcc5f2eefea85ce373ae721b8cd57e508ba55d846
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many hosted on compromised CMS platforms or disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=investigational+device+exemption+pdf PDF link annotation
    • https://kompaspt1.com/contents//files/wenojizowapadugigis.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/2bfed69ef6ee4c3847a614746fb6daa1/saxalodelagerima.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/nepejudavowutexo.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/21942020011.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b06ae4f42---99853679716.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/nanebase.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/72270398751.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/97127687753.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d0a1eb34---11499051635.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d81eabe3e09ca5a78b34d75f1f1aade8/rapakebidinik.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/89df627792b6dfd7fc121c577bdace25/74893083637.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1v6hvg0hm7d7b62iv1n68iv9ql/79607893153.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/50621916989.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/tisebokumakap.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/jk16jhcbmcs75qht1rqscb5faq/kirulemenarizogamemopori.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/65801933578.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930422bd70e---74934638032.pdfIn PDF document text
    • https://aitalk.vn/upload/files/titarizovow.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/77472449964.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/wativadigididadaj.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/74956926502.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/muvabexize.pdfIn PDF document text
    • https://epos.nu/ckfinder/userfiles/files/disogesaz.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_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 18328 bytes
SHA-256: ab02730691047801d49eb9084565724651596db63050c17a491c6719e60635a6
font_01_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 10980 bytes
SHA-256: a666f1ed80919b89be447fdf3c6e96a0bb3067764ddd2a1572602792c1ff410a
font_02_sfnt_off00014bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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