Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4213ca556e6163e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 08:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f7f6ad80483d20f03d762cd0d5ca7a8 SHA-1: d0e4bcc7d9e38168249028fa36e3a3f603eda827 SHA-256: a4213ca556e6163e13fc383b0b577af4d54c6207a5eef6140f540080cbd8acbe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a callback phishing lure, prompting users to call a number in a context of billing or security issues, consistent with tech-support scams. Embedded JavaScript streams are present, which could be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391af996bcc---lifunakefapudugevojezubur.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8a6cfdcc2395c245b82da1c0dfe81cd5/zagorudelew.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/22428904655.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/semoxo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/58182621161.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/xojilibupegalojezu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393547704a2---10990963431.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/saxibek.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/19481060527.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/54679961249.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/68370702134.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/78090956799.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/devutirumupuka.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/25215442645.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/fivaritusuwi.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/29760662410.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/zukotugupijakeb.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f7dd399e---topovalapofisop.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/luxefejosotut.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70e65ee24b4fbcfe23bde7485acc2492/togetoletil.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/57774418023.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/766cbe6148d54162533dd7c4c7f9a5ee/keweso.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/fupumuturovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=delete+words+from+android+dictionaryPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/damodivug.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10840 bytes
SHA-256: 61df7cfb98e40c94d3a9e61f3ec6b1ce8dbb36dc313c54835c7822024ab55331
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 17564 bytes
SHA-256: 204b554f45b9f87fe66d07ad2675e864288724fb8963c9418a65c5b40b36c6fe
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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