Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e21e0abf5493f…

MALICIOUS

PDF

100.0 KB Created: 2021-07-12 17:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3c03cfd7ebf5ae3b08d6faca7261e9e SHA-1: 2061bf099eb8c26997991dab6c6b094c7b8effa0 SHA-256: c16e21e0abf5493f1848e0dac82e2ad7065d6ae605cff692ff9ac45d5304b4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 6

  • 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.
  • 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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/m50ibhdg0c75htvj0uklbg2kj1/bireberetipojelelusum.pdf
    • http://www.klimavill.com//data/editorfile/24065761074.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6488d7a8db---84223499549.pdf
    • http://sequirk.ie/userfiles/file/9748514259.pdf
    • http://studioindelicato.com/userfiles/files/96624440091.pdf
    • http://cc-loges.com/uploads/file/19272957184.pdf
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/dexejujus.pdf
    • http://saltokisport.com/uploads/files/52441463926.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b06cfe70---52563859432.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8309132f63---72056325646.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72d1f12f5---45162667826.pdf
    • http://verypool.cn/images/upload/File/81660681930.pdf
    • http://novastal.pl/userfiles/file/godovasuwukofek.pdf
    • http://obasekiestates.com/UserFiles/file/89250379569.pdf
    • https://le27.fr/docs/file/mizigole.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5c082a3210d15d805c3dfe5611c9bad0/99250653132.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090248a4570e---94122142195.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1332d167---gimolesakukugoxajil.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/72471910994.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a58ee577---nelegazo.pdf
    • http://ahkjt.com/upfile/file/powojudilegez.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881e5e53c6a---7038003659.pdf
    • http://copingconversations.com/userfiles/file/gutuluzewofavivumokepo.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/74745588417.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/8736790568.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ieod25hqepfeogr6vg4q69k75o/31462939651.pdf
    • http://minicabii.com/survey/userfiles/files/vesegugebemapeli.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=physics+class+11+ch+7+notes
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109fb.bin
e887e8cdc329251b8aa7a608e63c9f3dc5c1f52a0cb1c144ec5d265fede29b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 10444 bytes
font_01_sfnt_off000121c3.bin
73a13d3807a5e1c5858cbb336cdaf116bdb1876c8f11e083623bb043ba6b53be
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 17244 bytes
font_02_sfnt_off00014ee7.bin
6ea839b6855794d3fb7b4f2dc059b096d191440647affa573e8dc9ae87dd734c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE7 17700 bytes
font_03_sfnt_off000169d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169D4 16792 bytes