Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bdada79081bbb2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 06:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a56d8b7d65c197b2bd29736b433764c SHA-1: 06c2afffc9c5ac49a7912c831c5c4d01443c41a4 SHA-256: 65bdada79081bbb2512c7796c0b4ed82605770544e9f2bda15a166159a46c9ab
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=led+smart+tv+price+in+pakistan+2020 PDF link annotation
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/sisag.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jopujisipobopugawozibo.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/98155778352.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xesototew.pdfIn PDF document text
    • http://techmechengineers.com/uploads/xojitazopinimotaw.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tujuwalefosobosugiderowu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7959ab149---zajaf.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/40803157076.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/zetadonifesuzomigel.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/saviguvikapakoza.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/godewamuparu.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23987888204.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e8072f3e---mamuba.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/romevivibimesunudot.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/fibisutuguvipozu.pdfIn PDF document text
    • http://theponghop.com/upload/files/72328905857.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/61217634376.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138434901914---19876770669.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/xidamefurifojo.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/jaxosozom.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/27481968507.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeaa57cb69---74459932130.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/fudurorexosawuwep.pdfIn PDF document text
    • 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 10868 bytes
SHA-256: 0181a4a97a9a802b3bf9d78d6a1b983eb77364fd4428c9a4b8d96dc30687a992
font_02_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 18012 bytes
SHA-256: 1b880f00e31c59eb22b7fb7fcc8654a1022d46990705c00023f46fbf98e4ebf7