Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed2dc1b3bac75b8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5d06680abeef249f92bdb97146bb288 SHA-1: 3022ff82b86f3433dfc35e45cfdd9ba2f7cf8360 SHA-256: 3ed2dc1b3bac75b81dc342da490a47ce4d48e07f724c9aaf9ff20956797e7468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=how+to+share+location+with+family+on+android
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375970cd889---norabaxasagagas.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98732102586.pdf
    • https://igk-lilienthal.de/downloads/38264659703.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a565c4c---misejapenebuvujokagor.pdf
    • http://margheritango.it/userfiles/file/lixujibub.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f271ff2c28---34289866911.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cc142b6c757faec1474a98dc78f8056a/35818562136.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/665forl6g19rf9uuqchchutgqn/1275808539.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5acd105f07c7dbe4734fac8df9412e1b/paxedupovimanojujeru.pdf
    • http://sanzmendia.com/userfiles/files/labinevadawok.pdf
    • http://mrpokedb.com/uploads/files/56431823587.pdf
    • http://canavesiobruno-architetti.it/userfiles/files/sitebotuguzejivujifovuj.pdf
    • https://kalimati.in/userfiles/file/femadupu.pdf
    • http://sun-green.de/ckfinder/userfiles/files/jisaredomegasarixaloxuwi.pdf
    • https://eminencesolutions.in/resources/userfiles/file/jidekugowonugin.pdf
    • http://gamax-motor.cz/data/dokumenty/66117498030.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/29873489153.pdf
    • http://ownlines.com/upfiles/file/kibusuvasovaf.pdf
    • http://epmachine.ru/d/files/51583609717.pdf
    • http://savitaco.com/uploads/images/files/finenaxufakatozuruzeju.pdf
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/sazudisemuzupevetefa.pdf
    • https://fiscconsulting.com/userfiles/file/kivuwudepotiri.pdf
    • http://aatmicscience.org/asuserfiles/file/79649188468.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/magisefonubodumigezumukum.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_off0000d759.bin
1247073911092a30cd3c08a83972e939670a1f18803fceee7f7fb5b23a5e8bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 18080 bytes
font_01_sfnt_off0001066d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 16792 bytes
font_02_sfnt_off00011e84.bin
15c6546edd03550c80fa9e5abe3041e181db8b24b3893890e11a227bbaa5aec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 10932 bytes