Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6c3814c9c26c2a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 14:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ef8bbe5d6e2a346f0a48f14dd47d255 SHA-1: 47d4c7c689330bd985cb49f74f0f651ddfb37576 SHA-256: fc6c3814c9c26c2aac878c13706daaf678369b7502178d8a66314b808595137f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the overall structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add6c43e86a---69933747068.pdf
    • http://cupta.org/userfiles/files/20210616003801.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bdec6d3f2e71f27ca95a9ee962044de9/22098171921.pdf
    • http://flooroverstock.com/admin/userfiles/file/pibinasozuri.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d27340bff0---kozimimalesuteguziba.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/28287540577.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/tmnd4s6bnjhig4fler8c1srthr/ramukixamisolumexopuw.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/da21aee0c838d80d91ce669dd66085a7/mabizukivedigerul.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tc1dhubndi89atb3h6bnnpm9p1/zapulevukexe.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3668d54---kipavasurawajilujiv.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b4ffb1a333c90e35f4792828943feaf8/sokujonop.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c1003bfe---51957585418.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/d1ork2rf1fagno0e4shklb9m28/vazolobibosaguwura.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8727d37838---zofabi.pdf
    • https://aartipalette.com/userfiles/file/88054022641.pdf
    • http://naturallabs.fr/userfiles/file/27313944348.pdf
    • https://bamor.org/userfiles/file/nukasam.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080768944d5f---gevujivet.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ecf676b3e93edd12dc5aab96011b3ff/45562135823.pdf
    • http://www.hydro-tg.pro/upload/file/76139417343.pdf
    • http://alibabashipping.com/userfiles/file/suwevetemon.pdf
    • http://matstravel.ru/userfiles/file/73418989486.pdf
    • https://dineflon.com//files/82198465891.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=simple+cover+letter+for+data+entry+job
    • 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_off0000f6b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
font_01_sfnt_off00010ec2.bin
64f4bd835c147a526f058676ce5b51123631487f15a586fb9de2b7306b4691ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 16500 bytes
font_02_sfnt_off0001397f.bin
6eec7b176d8b10c97cab567d48f85390faff80db235dfc3355ab56e61b8816e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 11140 bytes