Malicious PDF — malware analysis report

Static analysis result for SHA-256 239fc4117cdee696…

MALICIOUS

PDF

80.4 KB Created: 2021-07-01 00:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1377aa8f8b343d77db8dcdc2a4f54cf3 SHA-1: f2d8842d20db5c7ed4ca51ac51fb6cd65cac84c7 SHA-256: 239fc4117cdee69641b38092d634a311e6e86125ce6eaffd31bd63edaade973d
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of urgency language further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bioterapiazabiegi.pl/obrazy/file/39698262049.pdf
    • http://gerd-pollak.de/userfiles/file/26090233389.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/ronumepujegasifimes.pdf
    • https://advantagelic.com/singhania/downloads/file/sevelo.pdf
    • http://adamlegal.com/userfiles/file/rapitizejigovoxikofad.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/65d7cf0511cd197f4b01a4809492200a/vilimowalomop.pdf
    • http://utuin.net/files/fckeditor/file/zisatijasuzof.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc58681086---gatabolasaxizulibixexezum.pdf
    • http://capmar.eu/userfiles/file/taxotiwomobop.pdf
    • https://anthonygillant.com/userfiles/file/nopegovakugukerumapew.pdf
    • http://creative-format.com/upload/editor/files/89927179184.pdf
    • https://vibangthuaphatlai.net/uploads/files/10975468866.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/18281003657.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429024901767764.pdf
    • http://bidwoodmachine.com/d/files/lomisorikilupolijuneb.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/e9334157e44b9fb927507a10ea5ed790/17078740288.pdf
    • https://www.avantagesapp.com/uploads/files/86825690301.pdf
    • https://avenue102.com/uploads/file/64791412513.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608276c7efc8f---gipomefuremexevobobazoze.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0jb1o5u9selgt3jo3rhn28ojq1/kepodoniwozitusejuzom.pdf
    • http://yuhongzg.com/d/files/limazoj.pdf
    • https://cjsc.se/ckfinder/userfiles/files/30661729338.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/dulalekeziloxomanimupob.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7033f6c---26868112153.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+train+time
    • 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_off0000d96f.bin
7914672896b7df62d5a073ce57742c930640d03be5ee3719f9a1a8fbbd79f873
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 17252 bytes
font_01_sfnt_off0001064e.bin
f2c317fdab940d84c3a8131ec4dbc4b878dec606b76d4890ee628b049adc07df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 10040 bytes
font_02_sfnt_off00011c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes