Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d6f8afd121fee6…

MALICIOUS

PDF

81.3 KB Created: 2021-07-06 15:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d3e459bbf7d55e4c150d4ff5743584a3 SHA-1: 0bb81af622f2a4ed451a555ef614c5cb69389c4d SHA-256: a6d6f8afd121fee66825c6fd21912049441d5cb6d3cfdd8cb66ba87a3579e219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://faresaldabbous.com/uploads/files/74773679519.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089af38b8db6---latixo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d5e861e451ec8249f811bf7b5b629711/xizisaviwiramovikule.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/24062042905.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/54959993155.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/77974b5937f732ea23c72d17100afdc0/zejuvokiwuwewakizirozel.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab08cd5d929---natemelajibi.pdfIn PDF document text
    • https://agatanorek.com/files/file/16520257040.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f8dc0d5b2d3a3acd05f110de14faf6f/lexumerolawomilizade.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b410357abfa---dumusafimi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609150336932786.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/24e12b22ee948c6c3119167e290b3cc7/fenoxag.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078dee02fea9---podego.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/871d1a28a6078ced7070272a99d623f2/fuzis.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5907b44f---17311467079.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bbccef04---dadunonaginelaxiwukodof.pdfIn PDF document text
    • http://erictex.com/ufiles/files/varopujeramiwolimezemid.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/34046381074.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d11dbafbeeda499964a1f46ebfa41a39/89774201955.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c11218d52b88e573ece1a1a2aadfb2d5/41265748866.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37add08156---bukuzitogazadolobinatoter.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/aac818ad942ef1eb9e9177a17a7f8ecc/21463051339.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/29138325910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=calculate+net+cash+flow+from+operating+activitiesPDF 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_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16928 bytes
SHA-256: 841d65e8a991cc2616a9dca23aac204973e2ef835b97d0113aa16e49ebb398c7
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6D 11208 bytes
SHA-256: eaed05fa2b7b8aadccd8d309ff6c302f9700e5207a0e1af7d6f7e85529c742e8