Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26db8a35236f7f4…

MALICIOUS

PDF

81.8 KB Created: 2021-10-18 01:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10c227a8ccce0ecfe31deeed4f4d1f0a SHA-1: d73b615f6df021ac5dc1150f201d03f6ac975c64 SHA-256: a26db8a35236f7f4ca8cb329a615da25d254354593aa268a1167a8ab8cf1d6b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://booknowrentalimo.ch/userfiles/files/lumegufamafaponuxonekon.pdf In PDF document text
    • http://livilgirls.com/files/55132521217.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614aefea1bb5f---13053217829.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/99777882374.pdfIn PDF document text
    • http://poliinc.com/upload/files/96354381363.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/moribobopabemebawuzum.pdfIn PDF document text
    • https://camelcarpet.org/d/files/31290684071.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/44380172936.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2f09d639b---sakegitaxuzakov.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/90852643667.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/50824478290.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/rufamoxi.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/fitiberidufamupepalon.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/t1gq6vcim3bmpc1uu3buqln7ca/28547028895.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/38394629646.pdfIn PDF document text
    • http://tiguan-wiki.ru/file/73946596414.pdfIn PDF document text
    • https://angkagenap.com/contents/files/lexopenedowapavufenugiwa.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109152348242377.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210911_342F391016938102.pdfIn PDF document text
    • http://redactron.com/userfiles/file/50404980686.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/wolalajov.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vaxemege.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/rifesefekowuzojenu.pdfIn PDF document text
    • http://seamacros.com/upload/file/7408975527.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ef4082d22b84d865597f5f19b7be01e6/kudaziwalaginabasunasa.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/48501807585.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=common+factors+of+14+and+30PDF link annotation
    • 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 17840 bytes
SHA-256: 03e95a6da23376bc5fe84a6b2968f462e0ff76f6eaeb2aaf545bdf343da40f5e
font_02_sfnt_off0001205a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205A 10820 bytes
SHA-256: fd4ebbdab4ec9a94d9aea0d5457951b183b81e621fce2a1237f72bb28dad65f0

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