Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c63c9ba372a82f…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 19:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 857fa0a75c5a293e3bafd8e46c381a87 SHA-1: df6a489b66c3932759924500b11a34dc7a3ae300 SHA-256: e7c63c9ba372a82f9c8f7684dee7300d88e74b9ba9d9975fae05a06c5ccba130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://schodylux.pl/userfiles/file/paponakuvimukem.pdf
    • https://strechybenesov.cz/content/felik.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c67b2bcc8---76552489625.pdf
    • http://bronia.org/userfiles/file/1562674821.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c213c825624---zibifedile.pdf
    • http://sarljarry.fr/userfiles/file/sirituwe.pdf
    • http://dribblebar.pl/userfiles/file/9068192835.pdf
    • http://com123.vn/uploads/file/remisuvoxulijonafasuz.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de7333f87---gewabebevawilex.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/247bff34bffe5a64a7c465becd967725/6060047820.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/911406b11ebe41d001eca4ca1ac60208/bubasefegulunuwiruzenepix.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160800eb4e7e62---349949413.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2416fb5eed15dcb6c84dc78b0e0d0ab1/58999690196.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f75f198ba---lejojawinilemas.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1a576c4d---52348012551.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/270432d1ea2ca4588af8c8346470b157/46617573858.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c6bd58eb---20818587083.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0d61f332---gokid.pdf
    • https://rybczewice.pl/userfiles/file/rasigog.pdf
    • http://jingluo.net/uploadfiles/files/galilogemorujagoxikep.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e622da02f7eae6ce0c71aeccd5f7ab49/xivalumajo.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/bf1d5fbda26c9ec55f314abc47ad4c43/86711595532.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3e85a4b5---94179801386.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lump+on+both+sides+of+groin
    • 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_off0000f6be.bin
5e54dea6a2373accbcabdb6e4d8e9f45eb2954f3777a3217dfc43037c1cf5bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 10936 bytes
font_01_sfnt_off00010f69.bin
c119904203a08dc0a0ce1bb9d27bb19ee7e9dd7d6f720f59a8632a46fd62492b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 17120 bytes
font_02_sfnt_off00013c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1D 16792 bytes