Malicious PDF — malware analysis report

Static analysis result for SHA-256 111c29f585ca2921…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 08:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f002302ac485a7212e3a50048850498d SHA-1: ddc1c55768b27150e3949964dfd8147d3e3525db SHA-256: 111c29f585ca29211d0e81e73555ace4c3e2b887ecb140c16ebde3b607b0f286
164 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm with multiple URLs pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of invoice or payment language further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.iieng.org/editor/ckfinder/userfiles/files/jorike.pdf In PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/91881904854.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/uqd7u8i6fq4ei59nmgib87hanh/90819434142.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/xepejefijuwakibaniv.pdfIn PDF document text
    • http://camonetinternational.com/files/file/29656417956.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/14522682164.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/70807146132.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/dojavi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/39296506005.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/56237266743.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/57g0tsr9s79btorfjvdodldis3/wiwitusokajivagigebo.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vaxerikimabubupafabozesa.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/liditomilakumarowepobuzug.pdfIn PDF document text
    • http://floramarble.com/uploads/girejunasesunadidekufaj.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/80284541577.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/60247613578.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/javonelavofikuwikod.pdfIn PDF document text
    • http://gotween.com/userfiles/file///bojumuxowuloponokikazuvof.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/guxolidemomaxag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0612adcb---91554854535.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jenexexaze.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/vopogamelozomakiwabaniluw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132daab821cc---lubiluzipapago.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/rezabijimuvipakizoz.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/52730895660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=doublicat+app+safePDF 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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 19064 bytes
SHA-256: 2001827a7e3c8ca4d68bef0fdd9a3d8349544c6f2371cae56006b2c65920e208
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 10508 bytes
SHA-256: d6ec8a12a0bc9f5b86c2c2f4fc74ad358fa96e7af7695bddcba3bb5a0074d8d5
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1