Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c55cd69caaee820…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca428175b3110224c51b6d04699d5f12 SHA-1: 53ab865cedb6d705a6965fa22989f67cca4584c7 SHA-256: 4c55cd69caaee820a85b2601f6caa8a8d267afeca35a6b0b0db95a1b342e9f56
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites, and is flagged by ML classifiers as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing sensitive recovery phrases or private keys. While no scripts were directly extracted, the presence of external links suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://pistant.ru/uplcv?utm_term=android+studio+key+was+created+with+errors+pkcs12 PDF link annotation
    • https://cqc-material.com/app/webroot/userfiles/files/26821160884.pdfIn PDF document text
    • http://186086.com/upload/files/vibizolilu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fcb29d842c4bf98799e4ac4f264cdc0c/23415279288.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/tidipalodipaluxefelaxeja.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/zatavaworipololeniziwab.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210902100152.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51987231600.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93856971370.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/96697604735.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2977013654.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7bp75qrfgr67skmid7dnbra6o4/muzasutazosix.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe449041e---lodiluvatamokadomidav.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/13675816828.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9dvdugijiu2se7npigtlne3mjh/vefiramiwetokivatet.pdfIn PDF document text
    • http://artio.pl/files/files/vaxanukojavag.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43551876135.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/67575202490.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/65112379605.pdfIn PDF document text
    • https://qkon.ca/images/file/zarus.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/juwevafiz.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/razawivanizudoli.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/xodidofowaw.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/90146592488.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314b0829bbc---davuxetakeduwukowiwid.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9av7pa27j3tsui143r6e3f7b67/43595005862.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_off0000dcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 16964 bytes
SHA-256: 4550b0a419fa654f046624845b55dc465c9974e57c5eea72098aac9317f7b386
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 11108 bytes
SHA-256: 746aaaa5af856dce10217e0b5f9639b5fa9f719d5f2401a70c7f337b1d68ff46

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