Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd938b7571c4e14…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 13:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81b243f1908f3d15367ffd4f4a55e4ee SHA-1: d0ad36ba14876ec96400649ddead16533ca90443 SHA-256: dcd938b7571c4e1458116dade9dfa1016323a34f8752308841d3fa68ed76f58c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content or phishing for credentials. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=one+direction+four+deluxe+album+tracklist
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c16c240f0---21886486216.pdf
    • http://obrienbuilders.com/userfiles/file/35522038955.pdf
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/modupenezakipekoki.pdf
    • https://amd-export.com/site/upload/file/87357413636.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d690046b70---98984445088.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081849188dbe---xokekabogukenudomimo.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506675aeac---zewuwiwadijosexuz.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebfa768ca---butojasadamotigozu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a07863467---zemegidemiwuwatifipejepa.pdf
    • http://robwalker.net/fckupload/file/wokidoleteke.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/4978344035.pdf
    • https://tort-art.ru/userfiles/file/86244766855.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/57494942976.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/e59i2pr53i1264rf7jr1702332/65530066367.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0acdcfb60dd437e70397c3e886daef7d/xizixofaro.pdf
    • http://donauwell.at/userfiles/file/11497464303.pdf
    • https://salvatoredivilio.it/userfiles/file/50330044984.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e2583b4d---91689125948.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/m9nq7ej2eqkumlutjh734t7scu/volinidebadiwinu.pdf
    • https://stratasphere.online/userfiles/file/mikefazenadibosujete.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae295a95fa---91774785058.pdf
    • http://alibabashipping.com/userfiles/file/tazozijegijokudozef.pdf
    • 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_off0000e7ef.bin
856bf2dff4044fac54b5a4b34daaffe1c52c1f12fa4ab4a0ad17ae0437fb441e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 17324 bytes
font_01_sfnt_off00011508.bin
7013ed0e41ab2e5b9c5863d72566b3c93ee66e3fa85aea71ed0af45836b91244
pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 11096 bytes
font_02_sfnt_off00012eee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 16792 bytes