Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8d21180e6c027d…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 19:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f674791f63dbfb2d34ab17ca27d6cd46 SHA-1: 09059b6c29ce68ec1246cc63c78e456abaeb5e82 SHA-256: 1c8d21180e6c027dc032c86806c57383de14f444eac2ca7b503956d1edf54e85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f5e970c8ab---14505094630.pdf
    • http://matsonconstruction.net/userfiles/file/96311869354.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15733910289.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e4a6a5822---47097495802.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdad72e55---9913622153.pdf
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/pufaduwumumiz.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8e1a4448874295b8a2caed69f1563031/97488867516.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6f2fc76ac---tedab.pdf
    • https://bywuf.org/upload/editor/files/32975262994.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/88596db8b7770bd619dedbec1b1e551e/53421222954.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/n49393rv8nbqrm0o64f9m38pfv/busutofukupaso.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4713c22439c94ae11e9c29372772901/88366524413.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/1o1tsaon360kn7upfqc32s1l92/gurefidevorepagukogafuta.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t4n8d3d3p21rpva9p9kk6q21t1/rotororigoz.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160829743aa41f---rabikamowepanezugegeg.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/edcd4ef428503dc5b57d104edf0b26ec/luvegosawedewuvito.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2bee5e80---99833972419.pdf
    • http://budohurtsa.pl/userfiles/file/62775193428.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/127624e6644958cad439d016df79df34/51392275343.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/zijorafasuwigovuvelok.pdf
    • http://dgjst.com/upfile/file/2540645039.pdf
    • http://turagent007.ru/userfiles/file/11709874353.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608173626965b---nimexufomitivexujunal.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/joximesizumenuvovij.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/d08805f82a17ce24f13370e4815b6b5b/59264626332.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=madea+class+reunion+full+stage+play+free+online
    • 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_off0000f944.bin
8b266604ea6906315c54ecd66e41a514b3bc968ab2a812b9bbd9fd563b3a6f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 16804 bytes
font_01_sfnt_off000124ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 16792 bytes
font_02_sfnt_off00013d16.bin
8f166d0de2168934761aa62f4630c347f2527a41bde1ea9c9e6e4f5db2025d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 11000 bytes