Malicious PDF — malware analysis report

Static analysis result for SHA-256 7392bddd93f20502…

MALICIOUS

PDF

88.2 KB Created: 2021-07-19 15:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f0f3be3d7386ae4921ad6b97ffd18186 SHA-1: 7707ad4bce9b10d85a28994da7a7b9c3343dc3d2 SHA-256: 7392bddd93f20502df42e925db3f7840268089c0b6e554d1d861fc69e6546d37
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic points to links hosted on compromised WordPress sites. These findings suggest the PDF's primary purpose is to act as a lure, directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://przedszkolenisko.pl/userfiles/file/dafolalivigitodijawerafe.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/24748550697.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916b7479c4a---32273302738.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ribapiriletawu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fd6d332e7---dibavalubopijikasirox.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c6790387---potitikitut.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/befutaboxipuwo.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/1615911963.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/37304908989.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160715341a132f---76229809659.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cf83f972fe178e6eab300cca485f22f4/20095230336.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/36019800051.pdfIn PDF document text
    • https://onlinendttraining.net/files/34503363975.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cccbcbd75---nevifusuxa.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef6f87999bb6a78f9852f7d9c3953392/97142061810.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qupufeori38rd0r8fi4g5eqfuc/nekiderokereburan.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210719_1DBBA9EA81B8D6EF.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/54641861715.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/00684f63e09a8c57f7addbd32f54fca0/gogabuledereponusum.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/71985413159.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/60759037751.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/952dc804c62869d48f8ffcc1ca391c67/zipotefakitenuloragav.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wurejabe.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/49590574651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=8+hour+plankPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8992bc560a---61874685568.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_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 17196 bytes
SHA-256: 5762c5e2aebc9ca640c908255c15f78dc8e37c9c11ebf5bdf11b43bd9276220f
font_02_sfnt_off00013d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 10164 bytes
SHA-256: 1d5b5d79070587ee57dd3dfa0bea7058222352327b1027a0ae38e1fb455b0d18

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