Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bd9ee78de9c16e…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 12:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e78da717627cef8c9a7feb0ea8c60124 SHA-1: 152f665dc59bc06beffcf5634d4b2519d40a5eea SHA-256: 21bd9ee78de9c16e07b1341d734ffe36abc2bcd884e5cffd367e9afde87c4b9d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other unknown hosts, suggesting it's a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/16a5f79cd0dee4c9e71247a9aff2494e/renokagizopuwul.pdf
    • http://htygroup.com/upload/files/65066971201.pdf
    • http://ahcxdq.com/uploads/file/051355568571.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161047f47b24a3---68690084855.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee265691e6d---soxixunikapufokokenige.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/vitozobagewufepapukor.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/baninaz.pdf
    • http://indecomavo.pl/userimg/inc/13807560285.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a3b5c9311f55b6931f7b411612247f70/98377196510.pdf
    • http://gd-weimi.com/upfolder/e/files/20210812015631.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63c0ad582---bopez.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/xidufa.pdf
    • http://lideparts.com/userfiles/file/1624827211.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mfdj5bjsi71hounkuicrnfr8c/38236082808.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a30dc2bbce9---38127050575.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073369f957ef---zowadavijutaguxemawif.pdf
    • http://dent-pro.cz/pic/file/pizufimazawebelotebokafof.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de038c79445---91394269082.pdf
    • https://indiantalentjunction.com/milan/media/gasajogoxapekixaxeri.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/ziximusegigumuvu.pdf
    • https://tylbm.com/Upload/ckeditor/files/natusojur.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cabc085f0dcd0b1ed33abf0d14cd561/gujapusipomozelowedeti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=red+lion+paxi0020+manual
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/da5547ffb4b98e8e604191553254d1e8/66950749406.pdf
    • 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_off0000cb29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 16792 bytes
font_01_sfnt_off0000e33b.bin
b628aaa0d7d5fbafc9abc82b23e6ea0f7e2225ff773653ccbd66f082bfb46244
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 18572 bytes
font_02_sfnt_off00011418.bin
d30329767cc6038d56b3a9508ba20c4abc690f958c90e111b372f2144aee2fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10676 bytes