Malicious PDF — malware analysis report

Static analysis result for SHA-256 d061374120a4065a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 22:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a412640ea875fb0a4a2b31368236c8dc SHA-1: b935456633fccad93e272d549bc831257d4926d7 SHA-256: d061374120a4065a408c9de1a41bc696a1eba84c3a0e5ab414c5a335d29e04fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://fixafilm.se/userfiles/file/sodumuxesepugaferu.pdf
    • http://softwarefactory.nl/images/file/60424131027.pdf
    • http://jshtextile.com/UserFiles/file///pumamikokitogowuxivob.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/04dd2508a253dc715de5cbb6df10f811/kotipapeval.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/642f372a17d217ab4b62ba1dca3d56aa/6403296142.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0b397275c309ab20d55be617c04c390e/vodewujekofeze.pdf
    • http://mobilesamara.com/img/files/file/83185327434.pdf
    • http://cokhixnktientien.com/Images_upload/files/78529806278.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4ba4847b---11632614737.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vevj8kfkd3e5lp2auttpt67tp6/nikomepazilosepo.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/56960c0e5375710cf0ef2d4c84a5bfc0/74563992861.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d80f878562920f5791735dae732afb34/sewuvixuvutivo.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/2s9r8a4d22o2le3f5nsbofvt0g/lotajorimo.pdf
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/bukoxadegitugisefopina.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a3e57f3cd7f01c8dbf35db126b604542/muzugin.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160900307a2653---vewoxavibezakodem.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915bbd89bc9---66363227792.pdf
    • http://yachtandgulet.com/userfiles/file/woderoxixeraxuvejepil.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/50f01d5e47aa369f19bf73b45609cc38/lojuwupijapiwebe.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831050067f6---dinutanasivoxez.pdf
    • http://agendatourvietnam.com/hinhanh/file/bogizibubumumamafax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bash+replace+word
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd81.bin
efc04eef0409db473a6b826af4add4fd351fd7d7aa7579d91b7edab5f74589ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 10456 bytes
font_01_sfnt_off0000f579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
font_02_sfnt_off00010d8b.bin
61198a923a912330b7c62931ffd1b87428237ba226bdf2be0ae536b24b0fa7d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8B 18440 bytes
font_03_sfnt_off00013e90.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 16376 bytes