Malicious PDF — malware analysis report

Static analysis result for SHA-256 5939b629c458fe6f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 01:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 014a8612ca1aec7e3c384e110d46d970 SHA-1: 22bec8c066a429c2cb950a3e07df45fc30bc0251 SHA-256: 5939b629c458fe6fb5c42a8ca38f9168ae122edbcbdb0585357b6b1042094fa6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly requests sensitive recovery information, such as private keys or backup codes. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall pattern suggests a phishing lure designed to harvest credentials or recovery secrets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cairparavel.ro/app/webroot/files/userfiles/files/pizozejabozipasevox.pdf In PDF document text
    • https://snqrsl.quebec/upload/editor/file/pevegiludotenusat.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/20701863630.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/s2nipdqnbf4o42l70hq71gk449/95221372214.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/79112484139.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/xibojog.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95612438b886b45962221480720a6a54/81760048987.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc3c24abfc---97592020381.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e016fadc64---17065909293.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/1481074614.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4569f764---pigepavuwaropufazepozopur.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/bazizirebesosala.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/jiwonulesemule.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/liruxaderaxuvi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b90757ea---94765779601.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cf68c161f---73584385360.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/247a22a66fcde01dd30d5c8d513a8c7b/26744214670.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/kaxakazafapivaxesijovev.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/sutexiji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b0a2bac328972a82e1a4d71cd185c6b9/56892833080.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/83393451729.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/jeribezaberuv.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolapasarepazuk.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/miluliwiwokewaxejor.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210701153323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=digital+signature+certificate+renewal+form+pdfPDF 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 17540 bytes
SHA-256: 14497b1882844c25935e7f8619e18f98e718ec64f22535f4b151459053f4b9c3
font_01_sfnt_off00010293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 11152 bytes
SHA-256: 6f1e67f31f83c43d298333621aab6f4caef709467b6c3ce6f563a42a52c19f1a

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