Malicious PDF — malware analysis report

Static analysis result for SHA-256 324aced95f1199fa…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 06:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8708def439a4727517d27a780574ef7a SHA-1: 41cd98b8b06c58c2f0a2ce4b67eeafee63f7fb06 SHA-256: 324aced95f1199fa29d91de960caa3ba519baa8a51959ec02dba3f36267740bf
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to prompt the user to execute a command, likely to download and run a secondary payload. The presence of numerous links to potentially compromised WordPress sites further supports this, as these could host malicious content or redirect to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://smclassof57.org/clients/34860/File/sapexamir.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c425d54cf3bedfa83dfaa855e3c67f6b/furupa.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c8a387cf---rafefisonogaguvakamow.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61248975949.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f0k6c7shgvarrkjk9e69tr6bau/bexizapojimemafefisebex.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078b470b91f0---xudibiwabodemoju.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a800a9f4d---46784249432.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c04391df87bcb0153aa27d396f358f56/40208268450.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4b53vr36tave1t26e1c7f74uk4/29823306713.pdf
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/31406286772.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1slpensbsmqag17i1mm6nqu0q6/81088933917.pdf
    • https://aquafilling.com/userfiles/file/lufesuwusabubap.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/dujonugakafelenok.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/56df0aca087965873e54ad1616fc598f/terizifeduwazepew.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5851c96223d6b5f5d26627957d916fb2/xibujigov.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609016b8db9f7---zediji.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/ejumat45au70ggd2unqlhdn209/bepoxulowazufedikawu.pdf
    • http://www.deep2001.com/images/library/File/tojop.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076865423367---36196941979.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfbf39558b---66639641938.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d7fc45e4---25557315031.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/bebuwut.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083688ba8dd8---ronuvowelaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+create+a+server+in+java
    • 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_off0000fb6c.bin
3470b239739c4db54c6ff277ecee973870747452e7eb52251a735632e0c62458
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 10448 bytes
font_01_sfnt_off0001133c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 16792 bytes
font_02_sfnt_off00012b4e.bin
8f97ca63e17a731eab1fc6b43441674f502b4da5b5300581e801bf914df3bf73
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4E 17864 bytes