Malicious PDF — malware analysis report

Static analysis result for SHA-256 914b0a4e0ca208c7…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 00:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1c4482568c071e56a0a1ef824de3a36 SHA-1: 6a06db63fcfead68f887183bf8da6587ad7a9741 SHA-256: 914b0a4e0ca208c7ee9af1d03a85941b42e638280cb0c782f88148eecced69ec
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 distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the heuristics and URLs suggest a tactic of using a link farm to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://office-agglo-larochelle.fr/userfiles/file/badakeraboxilofunap.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bd224c9b943---lexesipu.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0d76942f---20165211663.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fad74d80528f6c03073dbb0cfd381876/bizupaja.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0d963918be5998030209f4282fadadf1/xivozotuwiko.pdf
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/sutotisodopezite.pdf
    • http://goldcoil.com/uploadfiles/files/getebabufo.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9a0b10389c7f2b1ffaa92e400dfc1e49/14665771531.pdf
    • http://ateliergermain.net/sites/default/files/file/82956533141.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/57055907161.pdf
    • https://cottonweb.net/userfiles/file/daxotutijezid.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609595b0ef47f---bekow.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738fb3bac8b---wudubipakupibikasejukabu.pdf
    • https://psychologgia.pl/Upload/file/13553273847.pdf
    • http://prmakeup.com/Image/files/memapovikixa.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cb3f9660c20f46cc6483a7be77e1ddae/99703401122.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/774ceae291552f3acf6a518d342a9070/45228628263.pdf
    • http://baigeleather.com/userfiles/file/puzemonatibukovawoker.pdf
    • https://nadamasristorante.it/file/43609832894.pdf
    • http://mosjob.ru/images/file/8863357210.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c370b024c---18772856982.pdf
    • http://studiocalcinoni.com/userfiles/files/mulog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+draw+a+minecraft+wither+skeleton
    • 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_off00010223.bin
b8a4be1b931ed5bbd6a828a48e21ad45a4110b805b08ff1e20f39957ff4c9a55
pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10908 bytes
font_01_sfnt_off00011b2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
font_02_sfnt_off0001333f.bin
732ca51439b26a9fb8f7a9e5c5cadadcd60bc4b28549ae6c396e841ab04a9f55
pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 17748 bytes