Malicious PDF — malware analysis report

Static analysis result for SHA-256 12df3debda6c7bdf…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 22:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3b031f5162a6beb524d0a7b0b5b29e0b SHA-1: 3855c894740b556d0716fd61f37d995c79c07885 SHA-256: 12df3debda6c7bdf5ac2559613b2edd44c2c38b3dbf6dbd61297a2b11da97ddc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised websites, many of which host further PDF files. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to exploit users by leading them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://stasta.com/userfiles/file/36549439584.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507014620270218.pdfIn PDF document text
    • http://sport-way.ru/img/file/97835065929.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7ece1d170---tonivugufusewazimiv.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/vosowoxajanepaw.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/budobapa.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fn8g3ljrbit5550jmr1ju6e8cn/26874814026.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tidadu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf5d0fe02---70691499016.pdfIn PDF document text
    • https://parfumzone.ro/files/file/56222425588.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ceee6cd5f8---39044595064.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/14435328999.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/bebosorepubisugamiju.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa94012ba---powafepiledobarizini.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16224667150602.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bf91118e---66928041961.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/25981382890.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7309dd7e53---zagawubupimo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fecd1f06e798ef65ce4b52f0d0a3cb48/10040428870.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/wobaw.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc11be323c6---92475971268.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/dakaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+law+books+pdf+freePDF 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 18148 bytes
SHA-256: dbde778fef72d4152672bab761c04b1b2972187fd97ca682dd9baee12e8ba861
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10620 bytes
SHA-256: c4a9f3b9de5061aa688406da39880e3ceb6e7d45a7a31fa6ee07a5c24fc92494
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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