Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ade186f5e86142…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 23:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b96d4b1ec3c557d4202021a47c4e912a SHA-1: d474bd94d13fcf679c106c49ecfa391e1bd4463f SHA-256: c6ade186f5e86142fae83e7f7e2416332e624fc656b9b8eb4682373da5503c66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://fasson.vip/images/editor/files/wipotaresasaj.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161448bff7ef6f---wajulevufugivirakazef.pdfIn PDF document text
    • http://watch62.ru/files/files/rivilelutev.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/gonok.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/74835693055.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192020522069.pdfIn PDF document text
    • http://zgic.ru/!upload/files/63638286588.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5rvvncnhhq53nv5r3n915c90o7/xazegutuwodad.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/dowiwofeporulatolide.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327eb4342d2---13052888816.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/nukuvedamezotu.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/detelozeno.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bowiwolosora.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/29459648611.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/xovidajidusaxugame.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/34476977286.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///kajuferafoxenibe.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/67401539878.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/64674932965.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1645b7765---12842744178.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/17155167781.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040cc5bc86---84706910176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=zombie+age+3+apk+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF14 18544 bytes
SHA-256: 4d58edcee2f02c7724e040c29053c02d15bbdfc07214e7c87d55eaae8349aeaf
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10820 bytes
SHA-256: 7a6be1f1afe17e4333cd9a0d556dc2f378d2e9b84cc0075141e4881db600095a
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1