Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc108a4defcde29e…

MALICIOUS

PDF

116.7 KB Created: 2021-09-25 01:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 416cf18c6d69c4710fa9abee05390560 SHA-1: f624f4af0d59a17c3a460e12798b099f019b6aff SHA-256: bc108a4defcde29e33093513624620787b7e3885a8dd400631715bb049597bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9598

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334bd2d98ef---salemineve.pdf In PDF document text
    • http://bettynblue.com/upload/fck_img/20210908/file/zufiweperexavelu.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/54875141500.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/45408776205.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/50351734883.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f073860aee---10176050562.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210919_50B404AAD98F99E3.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/poperobefeferuxik.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/xowijumiw.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76432ce09601007b809c57c20cc74c54/lanonar.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60f6e4b85---jasedusutabi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaf2d3b6c---58558257691.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/77034264112.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/637053026.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/bafutodumazaxezev.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/98lji54pcnba8hp77vrte4kcsn/6198728702.pdfIn PDF document text
    • https://5uempat.com/contents/files/92213132247.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/wozijazumexipog.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mutibemaza.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/86450413240.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/fenevoragusoma.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zuzugug.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vepisixopi.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/dowaluvoledo.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/95166126715.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109030328055534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+xbmc+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15236 10692 bytes
SHA-256: a1cf1b76719550c8a4a84e40862ee7dde9e67b9e2057aaf78ae3725ec9c714e9
font_01_sfnt_off00016a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A90 21500 bytes
SHA-256: 5466a61fbfa54dd4a52e518bcfb609df306b522f59e4decbb67f4fe8d60d39da
font_02_sfnt_off0001a266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA73 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc