Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a518e3d4c9a6a5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 08:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 348d8831dfc1bf07d383e73a11d46a64 SHA-1: 58b6767b9614718a8cf04e04e84635f2eb678135 SHA-256: 29a518e3d4c9a6a56e2e6a57e12924c09c9343ef611d7257ed1c2a7909916f55
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains or compromised CMS uploads, characteristic of a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing pretext, likely aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=good+and+bad+effects+of+media PDF link annotation
    • http://gtlmarinefuel.com/userfiles/file/9560236466.pdfIn PDF document text
    • http://cycling-software.com/files/file/xozunonabapiroxosutabu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1341a68624751b904b83aa02b523b6d6/15512014613.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133deb059986---baganufajor.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dolagukano.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/14587348675.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/48315471069.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/xubifegojaki.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3g4dm9juemmknjroqbrenoroh3/47770732208.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/up0lslpqad91c776t7ulo5o7lh/zufuvuxaxagam.pdfIn PDF document text
    • http://noelex22.org/userfiles/file/powanedovirili.pdfIn PDF document text
    • http://kaies.net/upfiles/210904074944992386w2np50.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/sofipuzozosapeb.pdfIn PDF document text
    • http://gibisch.biz/files/files/32589330260.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/gopemosuna.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/63429546312.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/lakefererakupekonolileror.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/33692749804.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4e317450716aea1ffc9ef061a664f849/witikidutowukuw.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/33622029659.pdfIn PDF document text
    • http://savemaxint.com/files/file/71077953776.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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 17560 bytes
SHA-256: 34c9e60e263944cba4635e43b96abef5bc29a6c2bd5acaac6c80595af0c5a1df
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CC 10668 bytes
SHA-256: 731f0d1e359c0f51f10775d41f89c9f61df7cb234a8dd07f6d6f6ce16b89aceb

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