Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca42f27fb8e601e3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 19:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2413462dd1c24067d45507697e58d685 SHA-1: d3f94ec96ec836b564c317160cf1bf6a6630eb35 SHA-256: ca42f27fb8e601e33e03a9855e9dcbe82bae9c883ded3a424850c0fc4a218205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://twr1115.net/files/fckeditor/file/1652792808.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608673b984e07---41048215769.pdf
    • http://www.derbysignandgraphics.com/uploads/file/77451639111.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6f93334559cbf469c6587106c5ea4dd5/29523497492.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a5kqfgfrkb35n3vmtnr7suoco/89891483847.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/tupodavidifevesoxoloz.pdf
    • https://sonarmusic.hu/up_image/file/nofemaninofoxifiw.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/7blopi494605ee7os0ifn3gs2m/wipefubuxunikozerujitovak.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cbb598a992f98efaf898b0acc3959b6/62668540658.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/c1a7b4507bd7691ba340b4ed3940a5ab/gudejezajer.pdf
    • http://www.europesolidaire.eu/userfiles/files/xikoxeparuv.pdf
    • http://architettorobertafasola.eu/userfiles/files/64930668364.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hsti728nfu8cb5jai8g8nribh7/nijajuvigigopetimivozum.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4dbca5216---fuwerikeji.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7db36bf2---59316812097.pdf
    • https://cgeminfos.ma/upload/file/nivusebasivisode.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdcbd4f11b---54575684553.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/877fe8fd76458c4fc93388155a498376/segejoxazoxa.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/44270115087.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4a2033e6f087768fd064b71416d79530/9105545098.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e17adb3ea3---ragukafajus.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac456da6386---28648721065.pdf
    • http://digitalpolicycouncil.com/imagenes/file/48235881261.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jhboq27vml2hq0hpaf6ht770uo/64830013107.pdf
    • http://gandolfiarchitetti.com/userfiles/files/25112697298.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vlc+android+4.4
    • 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_off0000e87e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
font_01_sfnt_off00010090.bin
9aa3405bb2de6fba49d9c0cbd140764dd55cc35dd6c28433a6a55144255e946d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 18616 bytes
font_02_sfnt_off00013092.bin
8d43769a6a77c8d8919d0f71647da28b9840cc5c3bae8df860c7cd1b6661f7cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13092 10076 bytes