Malicious PDF — malware analysis report

Static analysis result for SHA-256 55eac2c6604067f4…

MALICIOUS

PDF

73.3 KB Created: 2021-10-07 19:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58653d13367dce2fec347cc02384c8ae SHA-1: fc789020cb2b6c0170767a2ba6387b433a8fb3a4 SHA-256: 55eac2c6604067f4b767438a8550478da618ee6903c84994a0d540cc5abeed9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=solution+manual+to+engineering+mathematics PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dbd05e24984394f60f0da6c9feceecc1/sutagarot.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/50938465922.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xadasutixigul.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/pexipapemajegexesud.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/61412384683.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wopajolij.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/sabuponumatepeg.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130e065e9410---tuvon.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6ea6216cc0551f5d70fa46bddc0b4957/14445221526.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/nezaxunogopuzavof.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/romitovanagosaj.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/86138066056.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/durezixuxukawava.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/20159352235.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jatoj.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/jobugivegadorirakudavev.pdfIn PDF document text
    • http://rapet.hu/files/tikixufufeviwig.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gisofejavuf.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xorodogebuputowalu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u6k156vo37d4qupmfur3nihp20/88686189123.pdfIn PDF document text
    • http://excellent-art.com/userfiles/gabonex.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad4a1bc0e---49601422193.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615730df021c8---82490443447.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/godegafaferaziba.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9424c18f---bubozelilezezujoxarepixap.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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 16672 bytes
SHA-256: 9028f38d8d6fdda65a833b6542173ba427823aa78313224ad2db5939118a2db2
font_02_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 10852 bytes
SHA-256: cbba3d67c7b66fa7d526996644565d18687d285c5aa7560d3e16f189106e69e8

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