Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f230efd9ffe909b…

MALICIOUS

PDF

81.7 KB Created: 2021-07-15 21:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1916760255112fc3ef74afc09602220 SHA-1: b87f33a6e8c65778f4c58d528aacaa8687c2be00 SHA-256: 8f230efd9ffe909ba7eb77a9128414e8548f04f3c0e4671684b960245f19556c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sharon-barron.com/userfiles/files/59221635260.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6a57c8d74df9a5f796fe09feb134fe97/dataledewodenogav.pdf
    • http://bmcnx.com/userfiles/file/58109213443.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bk3mgk4kpfnmoo97nm9dmivlvf/wagiwan.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e9e53e53e---2394128827.pdf
    • http://short-story.ru/upload/file/88812317855.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d95f76d82---6336394238.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/35920456605.pdf
    • http://alemotta.com/resources/original/file/38991278016.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1a6ec0ea102436991a51cafa866594c7/97152196022.pdf
    • https://advance-pack.com/editor_upload/file/39795200801.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9581e4d45---66799628490.pdf
    • http://omgmediatank.com/userfiles/files/ribunevaxurunubigukaf.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075617e82c7d---97938875082.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842613c73---karotumadotunarafurenutu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dbe86c168---58261704393.pdf
    • http://kovacsoltvaskerites.hu/images/file/26375945335.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0b11695b8803c77aff9806426b4ab0b6/lusexalelelit.pdf
    • http://iberia-ex.com/images/blog//file/37174785093.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6ad3122c---34107730937.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/sjl3rkabgmaj89gf4vlqlhl02a/pisitisawuxutemamibenigi.pdf
    • http://imi.vc/upload/files/juxobaritinarunivetuxire.pdf
    • https://mmagame.com/userfiles/file/sorexor.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3435747c3---79750077030.pdf
    • http://studiodabo.eu/userfiles/files/26576904655.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=division+of+integers+class+7+worksheet
    • 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_off0000da10.bin
490c54fd0d1356673c08efca0f05211ba477ea9e71ec17553258ecc3fbaf8047
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 17388 bytes
font_01_sfnt_off000107eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16792 bytes
font_02_sfnt_off00012002.bin
b456f9002c951523cb00f583501e8b3ee69151f100105d9517341156df0db826
pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 10912 bytes