Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f37ef5e262329e6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 09:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bbc023b58dccb791044aad1d3a3cd54 SHA-1: 7d643df0eefe260a961942a58522b64f6db64f08 SHA-256: 1f37ef5e262329e6b2dfe5a8cdd6eaeac9356fda903f0d78fb9f23ab4bee23eb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of urgency lures further supports a phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://landatur.com/files/galeria/files/zigaxanarimusogilonu.pdf
    • https://successalpha.team/upload/files/35628016734.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/56180162356.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fca429d371a665f0d9888c21225e18d9/zemiz.pdf
    • https://allora-tour.by/var/upload/file/pireligarajujivokugun.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/3214818270.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131479850efd---seveve.pdf
    • http://skomi.ru/img/files/file/86910375093.pdf
    • https://debo-fit.be/userfiles/file///mimitimeriveriruruxi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613512082f175---zarekogenuma.pdf
    • http://lesen-und-schenken.de/userfiles/files/juzonotigunabusejisi.pdf
    • https://siahotel.com/userfiles/files/9450824588.pdf
    • https://friendsofmultisport.com/ckfinder/userfiles/files/18195368500.pdf
    • http://doingthing.com/downloads/blog/geust/files/69299468258.pdf
    • http://sunriverps.com/data/editor/file/85943655835.pdf
    • https://smartcirclegroup.com/userfiles/file/79951854222.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/40524140399.pdf
    • http://german-ex.com/images/blog/file/69008843389.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6037c6da---68831618797.pdf
    • http://www.darvidproperty.com/news/file/83885674848.pdf
    • http://nrgmedia.hu/files/file/malenamidatowen.pdf
    • http://kaie.org/userfiles/file/20210913120354.pdf
    • https://turasmobilya.com/img/editor/image/file/40689369096.pdf
    • http://shinhwajudan.com/userData/board/file/17190991201.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fowurigesubidajuk.pdf
    • http://fantalife.nl/userfiles/file/71857594592.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+alarm+clock+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d928.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 16792 bytes
font_01_sfnt_off0000f13a.bin
fa4f8aaece13895ee5120c4b45f8ce50c323bb506956c4ee1887ffa73a1667bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 18696 bytes
font_02_sfnt_off00012229.bin
382f6f6cbc19456767f2429ae23f8ebfa580a7baaaa6985ace06cede787e3d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 10484 bytes