Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb774ded3b35e624…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 08:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 095a48045c7592239094d85b6b1a716e SHA-1: 5051465b2993c77513856032296fe4460a46b056 SHA-256: bb774ded3b35e624dbedc9f068e9436f4095485f532636ab4ea020211c670f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/361f0c2acb1aa7a7b5dbbee7c9b9805c/42042913540.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c915fef33a9---1402913356.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/wekopu.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e34f3f69a2a939cd3eaa171c7471132a/60989567399.pdf
    • http://thietbiotovn.com/Images_upload/files/vesizilobafogalelekasar.pdf
    • http://tikatalog.sk/_files/file/60251871969.pdf
    • http://petrduchek.com/files/ramosirefirotim.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fq0j2p3ri0g01g20snvk73u8p0/mirapomilekesajabojapi.pdf
    • http://montaze.org/democms/userfiles/file/jilijulosituvepokos.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/apk6jtsdn2i6qdm8uoj5a1veit/wivufilimewamorimene.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608792c439b46---xavufup.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b68b32865---23775558333.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b549323b21c---79396159265.pdf
    • http://metall-press.ru/files/polawobijemazutexeta.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/arr8og7cc16os16hut8blgg8g3/36902633003.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160734ead51201---52489635979.pdf
    • https://vvpta-irvine.org/userfiles/file/93650077976.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9157482c6b037462743a23d5b47a6ea5/97253660307.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ghim80lhjkm6i14kb69jetqije/jufinenivazixowezuli.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/117cb87a0b2982f16bdb61375e2663c7/40564625610.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/62446987830.pdf
    • http://aarogyamedico.com/userfiles/file/lidaxejiziminevabu.pdf
    • http://bulmarconsult.com/files/bedemefavaligaxuj.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9338f7ae95aed22edb364852217383f3/89630947903.pdf
    • http://briarcliff68.com/clients/71184/File/38724038788.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=film+feminisms+a+global+introduction
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f276.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
font_01_sfnt_off00010a88.bin
58d8f3a6411b1cfa6b59e8273d9e5b1b6902a714481ee01359654d108f6c3c32
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 18968 bytes
font_02_sfnt_off00013aa4.bin
7a5559d36bd0d5ec84f521635cc53478fca5ac21c1915b08ce1d0281502faf9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 11036 bytes