Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac3ff79ccfc8cf2…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 15:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84fcd55c2f9e77b3100bf8a87478c387 SHA-1: 683380179c1d73147bbb718ad8aab6afec9e3c79 SHA-256: aac3ff79ccfc8cf2ac15a25c90b7bcc7a447ed147ccab78a0ee6370831aaf086
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to trick users into revealing sensitive recovery information. While no scripts were directly extracted, the presence of numerous external URLs, some pointing to compromised CMS uploads and link farms, suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • 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://poganyvolgyi.hu/userfiles/file/57899096919.pdf In PDF document text
    • http://surausa.com/uploads/files/tategapimudusekikofi.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/teroziso.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/bosija.pdfIn PDF document text
    • https://netlandschool.cl/files/85234101815.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jutamazusotipoximi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/84381582889.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/nufari.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/rifugixe.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/be1658dbd5ba1e75a3ea10a83b7aff76/15184735154.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160725baaba15f---63704316099.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/nidaj.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/34549054140.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0nkm62qc8gi5e0g7133tcalpa8/34655293166.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e4ea2152c19533bd47d3af261324c870/60120403519.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d89c5ff2642---kolowanikifatakagemafu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e8f061ce04b3ba3aaed39e6780c728d7/fupewebufipapova.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gtpt69c5qg5l0debo9gftknth3/vekemuxuwe.pdfIn PDF document text
    • http://xsjprinter.com/d/files/31001455124.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nazaxiju.pdfIn PDF document text
    • https://samowar.ch/upload/file/tepidu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/zomelidor.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/molaxolamukoxevuzuxu.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/35325478584.pdfIn PDF document text
    • https://regenerateacademy.com/file/fanoke.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/29123116339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=prepare+report+on+e+business+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_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 10688 bytes
SHA-256: 531fb22b077986045adf9f2f44ab6ed1624e0777c044f3fbf77079a168ecb7ed
font_01_sfnt_off00013400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 18636 bytes
SHA-256: 7ab64a6e7a574e693ea1353a4c2c59115fe9036a127499dacafc986236f031dd

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