Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3742ef5c3ba53a…

MALICIOUS

PDF

87.7 KB Created: 2021-08-07 09:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ceb00a24118bf440c3e02d2f64f78f90 SHA-1: 82e3c55d493aa371b32992495968491910ecc6ce SHA-256: 4e3742ef5c3ba53a282128740e820eac588f80d794b48c2ad2bcaad032b093cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised WordPress upload storage, and exhibits callback phishing characteristics by prompting the user to call a phone number for urgent matters. No scripts were extracted, but the document's structure and URL patterns suggest it's designed to lead users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609abae98cdb6---mosukujonenug.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3kc6qv7uugiu99cq1o0vfjo7k4/72112321605.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094616ba9968---sokamaneferuvinesirimupo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2b5b6b830c7378e6863411db5e8f3593/xavoralenubopejovum.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/laxosefutibesepamevides.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/sutepilasojexobiduzu.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/88114552576.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf794410278---gadasasobasakekolevor.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50745831556.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9f9744c80a2e55f1d2971af9d8ee8bce/87932585664.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/xugubudeve.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160999ba76542d---96137817113.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/85252e68b0b2bbf4172aa0fdef186906/raramuk.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f86fa38---52284718485.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3bf70dff18---ladanofuzufiwufezomovukub.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/95012282482.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kalabekibasewuzerisaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92755a40e4---52388561485.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kakikokisegube.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e22762b809e4a54960c331a05b0e9985/25253707942.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/fenadiwapopesilunoluzita.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2ffbc29835fb59164ac1bcd724ec0db4/40153750231.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jitajokisamijafuwasut.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/51584709085.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/74970170900.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8734ce8f5d---22355587652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+start+an+egg+production+business+in+south+africaPDF 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_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 16764 bytes
SHA-256: 7268ebfaef6dfab75cfb759814005787b6318b0a4b7573ce8d946e8dac2b7faa
font_01_sfnt_off00011e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 11172 bytes
SHA-256: 257dc6942de2d43e7239dc8ab559a00633bf2e78b184d03f89fff8762eb51f86

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