Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b4754f15ad5135…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 21:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b3b95a894d5aff2ded3d130e1130e7a SHA-1: 418a290b3211e729f9d58d76227bd805503d2e43 SHA-256: d3b4754f15ad5135acc9c6d8d64364fbba8f7b3a9586e0b06350f59c9ea52b7b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely to distribute phishing content or malware. The embedded URLs and link farm structure suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=baby+swallowed+meconium+during+birth
    • https://akapacha.com/userfiles/file/75872456150.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3gp7ltaukg0cb939r1it8bqtld/gubibeme.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc344f1d2---kilumulasowozupubuto.pdf
    • https://lasanisports.com/files/4598897272.pdf
    • http://ffarchitettura.it/userfiles/files/39782713296.pdf
    • https://jerseyshorepirates.com/userfiles/files/91050477266.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a9052757977664e178279187b24d957a/sikamaliro.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e63f15c7---motasoxuk.pdf
    • http://myhomeinparis.com/userfiles/files/9649579388.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2osqg32csoitchdgfaaieph2u0/47208145602.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b60anh8qul4cnl3t8bdtn7bjfr/sazozufekefur.pdf
    • https://gachbinhduong.com/upload/file/86299731136.pdf
    • http://studiopignotti.it/userfiles/files/93386691559.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1a9248b6c9f32a2bcf782f647830f2f0/4581635473.pdf
    • https://airshow-bg.com/file/jexutaxet.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/moxumenenon.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//17315075117.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/69137b31cc2f4976894f1adbb2689754/xejinaxu.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0527574317---xameti.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_off0000e830.bin
3ca32d4faec99e26fd6bfa012ba3807ef78a3651f1be4ce3e9fa2d704d86e0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 17028 bytes
font_01_sfnt_off00011463.bin
3c2a34ee484035c6a443817e24a292cd62bb1304d39c737729fc26c896682aa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 11308 bytes
font_02_sfnt_off00012eb1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 16792 bytes