Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4d40b478ba0e1f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 19:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 479c4c82331bc8904e50f52b0872bcf7 SHA-1: ab9f771251e06a1489cb9b8ecd19ff1ef8928e90 SHA-256: 9f4d40b478ba0e1f59c7cd77f7383a5cb49b3ffabcb72d5b5c3f5160ac66205e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to various domains, including compromised WordPress sites, and uses UTM parameters to track user clicks. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the overall structure suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=nitro+pdf+converter+full+version+free+download PDF link annotation
    • http://duonglaohanoi.com/userfiles/file/sapamofepisubazemuponer.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/novaganazumigugasezizado.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/vivozidusemarabekok.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/sawejisudezeta.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95641386298.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0a3be8aa4b43717234eb5152eccba309/48733170392.pdfIn PDF document text
    • http://rotang.net/userfiles/file/62248395863.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/nimuzezojazowumigemo.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/damewafababifavevamenuv.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/xavofixobatawidedekeduj.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/3778008060b80cfb563f3.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/segukaru.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/54462595267.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070a9acab207---93815337928.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitilukivaxav.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5bd274d7ea59fd853e84a5c7f230a73d/86471070258.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/29f544bc0466455bb6730ebbd1f97d99/64160744266.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/31578804399.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-19/20210819232600525131.pdfIn PDF document text
    • http://suurelepa.ee/data/file/47517728477.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_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 17192 bytes
SHA-256: 07c23b0f17a880c366706531b999abc2248baf0010c947d96c696c29bda798e6
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 10840 bytes
SHA-256: a5cf6685be391c260310ec0490b629a004bd53ca83585c67640aa232292c15fd
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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