Malicious PDF — malware analysis report

Static analysis result for SHA-256 2539770b9b755dc1…

MALICIOUS

PDF

67.6 KB Created: 2021-09-18 01:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55c1c1204525cf11c8140dbf3a29b99c SHA-1: 3e8fc4bdf468d8c19952e222a83c2d6dd87cda91 SHA-256: 2539770b9b755dc1762b165e357dabf9d2aa506a701b395ced13be384bb952be
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document structure and heuristics indicate it's designed to trick users into interacting with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://shahgrp.com/uploads/44123251668.pdf In PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/19313625154.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/bokatawakalitu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tuvid.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/luneripaxodijivu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8400498acec4629922ddae3e83c91391/78107107780.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/36307007308.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/zugikanipelube.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/50958968231.pdfIn PDF document text
    • http://snft.ro/media/file/64804732286.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/213691e82bd363e7ec93220a5862c69f/97438950833.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1d394f5---23244717509.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/49355231281.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/wipixiwu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133356bad84b---38287321147.pdfIn PDF document text
    • http://uhorder.com/upload/files/zanin.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xineterefiselovumunegowo.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091700474580554.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/kekifo.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/93758182919.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/liragawotebi.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/97995112256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pc+suite+for+android+mobile+free+downloadPDF 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_off0000ad17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC529 14036 bytes
SHA-256: 96bd24bcf5cef161286b9b85314b375a8894b77553c904cd3def1e09916af509
font_02_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10964 bytes
SHA-256: 6dfdd66b265f6ee3f5b2a7e25f499da26269c70a148aad0a0e6007ab896a4133

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