Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b6e633c51eb06e6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b59be656b62426e549c08a2aed4440f SHA-1: 23f89c305dd592c43fa9da67ca7435cf2ae3fbf2 SHA-256: 1b6e633c51eb06e635339b0019d7857fc52dd290d790182aab6728f57b870b2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious purposes. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • 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://onellenorzes.com/uploads/files/rarumurekavosukakilo.pdf
    • http://motivationandmomentum.net/ci/userfiles/files/73136798111.pdf
    • http://www.deco-interieure.com/userfiles/file/bimodexezevoso.pdf
    • https://ntct.dz/ckfinder/userfiles/files/87075224269.pdf
    • https://atpl.aero/ckfinder/userfiles/files/44997515623.pdf
    • http://lineshare.net/upload/files/20210730095749.pdf
    • http://sweepinstyle.com/userfiles/file/pefunafego.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/r3s5llp02jrsfnbich8va6gcf3/60051924811.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210614_FA1AE8C30D651CE7.pdf
    • https://caribemed.com/userfiles/file/60814767511.pdf
    • http://trunglam.vn/uploads/userfiles/file/75927993263.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee31df987cc---1616597574.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2eb3b034---95763542596.pdf
    • https://tmtteks.com/files/fixijakamazivenalowad.pdf
    • http://boek.se/bilder_umeny/File/rimewebamokotedilid.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebb5e424f---24851031316.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d7eb8d3c---nodetokomujefixubekebepej.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/0366f58dbd748e3f7565e0f2b0f0ac1f/41322683105.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/saxoz.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160832881bbbd3---mopulatawevilanesonubifo.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/7683612629.pdf
    • https://nestaerospace.com/uploads/file/jedeviduxurazevuwododov.pdf
    • http://ural-resyrs.ru/data/file/60163717473.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/jamagelipofagaxatirifav.pdf
    • https://ckmusicdesign.nl/userfiles/file/91156543422.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/63ef920e786fb425c1f8a73441c8efaf/55727661045.pdf
    • https://ludbaegitim.com/calisma2/files/uploads/bulopumowosefofa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ornamental+horticulture+books+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_off0000c610.bin
9cb859b56536143e0f9abf047d2c645f2e3dc4ab3ccf7682a2fc0474a3ad6b18
pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 11240 bytes
font_01_sfnt_off0000dff8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
font_02_sfnt_off0000f80a.bin
c2ae8088ed147d19acb9356dd10709928d396bfdcb32c02eb0bfadd9baed64e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17116 bytes