Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c1d319a648be38…

MALICIOUS

PDF

137.6 KB Created: 2021-06-26 12:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4719bfb2c43e87183eebea326cc2699c SHA-1: ea134928592901a799572ba3e464bd663351465f SHA-256: 22c1d319a648be38aaf5664ae22de26f809182f1f8c09b1f3b6adc1045f33c65
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish for credentials. The presence of multiple distinct hosts and the use of 'utm_term' in some URLs indicate a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.sport-konyv.hu/userfiles/file/gijiravezerezedojepobipup.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33775362d---bodalujatijagewulibopatu.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b701f4c8a3---sugorunaguwefoxojur.pdf
    • http://hydrogears.com/survey/userfiles/files/30497437535.pdf
    • https://iwistw.com/upload/files/12997647793.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b006f50da773d35f2c26577a4066371f/wamazomago.pdf
    • https://sardavetri.it/userfiles/file/sunugolojoti.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090031b85922---47473836628.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/zidozegarofumikosogefatux.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/15608742758.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/5391fba82bbda27764f15da62e2a5e45/63171182982.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c034b9c6d7b---sibipukitomadobosabeziti.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090711c60b44---bepukemikafovozelesep.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/780k1es87edlfaj8tisqfegnq0/2257458968.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2muti2p2b0ec6q3evfgomlf1c4/betir.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b5b6f216ff04f2d92c48fd0df635435a/88704065237.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/detozodisamibivix.pdf
    • http://przedszkolenisko.pl/userfiles/file/76318164625.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c5973107c---nilibamoredumotelo.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160967053c54cd---kofafawakutubukopa.pdf
    • http://hitecds.com/userfiles/file/lolevufado.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=basophils+representing+in+wbc+is+about
    • 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_off0001b894.bin
f417ff92d9e62b1dbb00357a261534bc638450f7472343871951b11723c97c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B894 17872 bytes
font_01_sfnt_off0001e762.bin
26835f941ffb546098a0593097721bc94aa6a6d3c2df83c87e70189f371480af
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E762 11032 bytes
font_02_sfnt_off000200ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x200EC 16792 bytes