Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3d4450ffb0afb6…

MALICIOUS

PDF

100.3 KB Created: 2021-06-26 11:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9922d9c04de1ef4640d6728781eecde2 SHA-1: 0a7f45157399b593015ab857264212965db70c6f SHA-256: 7b3d4450ffb0afb624a03cc22753d640311bd767ad9665f697997573bb2cd916
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d16a3a02---89567485589.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab5183a76---dusukigagisadiguwosanojox.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c923d0230f7---jenedelovofemovudade.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8260aec45---lemomegiremutevubexujibi.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0563lm7ao37kq2u6ku9sjku4ee/58730279780.pdf
    • https://morabia.fi/images/file/novuzoxofewa.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d537e036---govodavavabas.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ce8b50e18---rasetulikobojalatagavazer.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lspjso33cslo4v504pdbp1am1s/woxowu.pdf
    • http://younewstoday.com/task/userimages/file/favejuvibotatekasixazuzil.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160792fca0f325---joposogivupafawinuwug.pdf
    • http://talleresjpg.es/img/file/86889875635.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b7a8e7ef---72897200277.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gk92bctllfjl58rs4j1i5u0ri4/jezaboguvixakelubixi.pdf
    • http://kaupa.cz/userfiles/file/96420436189.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbaec23d8ea2be48bcfe52ea20bb4baa/ronud.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e476cc45e---14526870205.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ihfo0u49tbmskor3l2epot7gu8/53912677846.pdf
    • https://cesiedizioni.com/userfiles/file/saxanowunakisunajorovej.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccf3ce717---sokodibikusigisususi.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f5da2b33c---warowewavulatifulafapuzaj.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/21223d755b65ea0e1702e3e4493624d9/salawasuxuwak.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86d3e29d9---39912686109.pdf
    • http://goref.ru/files/file/wimudil.pdf
    • http://ligneus.hu/upload/file/49934298566.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/64f5f8bdbbf2d05e0e823dfcf891c3d3/8244771995.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iq+115+meaning
    • 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_off0001271b.bin
56a8869db37c6305d45a781770bf3317219c1328f4fe45dc5cd1bede68813264
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 10204 bytes
font_01_sfnt_off00013da3.bin
bb87b3c1c12968291afdc920d0dc8e7a1aa84a0b179790d96baf510d79226f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 17620 bytes
font_02_sfnt_off00016bd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD6 16792 bytes