Malicious PDF — malware analysis report

Static analysis result for SHA-256 351edfc60e2ba062…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 10:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fc6701e335f936a157e13f3f185353a SHA-1: 276bab734f9ae5fca7eb249a1106c579b717337a SHA-256: 351edfc60e2ba062f5acc1153757be9adce38b544165840b087d7f73111ddfda
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other PDF files. The ML classifier also strongly indicated maliciousness. The document body was unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kimhoatra.com/upload/fckimagesfile/xorirudafomubevaxaj.pdf In PDF document text
    • http://to-tuong.com/media/ckfinder/files/jogumepukapumid.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3e51b9f9---tesiwodolisivonavetena.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/88890986411.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/52201099819.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/00fc09780f32f06f8bd236a2c27f7f48/9326983748.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/ferukija.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zotodobilotawowugex.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a0586b404d97d3f5b4672da32ae2acfb/47291015843.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/87728536100.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23050406338.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/sinasatoduretemibuge.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f94dec9f---70883372089.pdfIn PDF document text
    • http://hexindechem.com/upload/files/92424187790.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/piripizezesototi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be7619447---lipibukowumodimafijakapoz.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/89024284260.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/zurajulam.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/32697633480.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/repasijuzo.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/noviv.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribejemepafotijoxinogiba.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cdb9e320c30882c5794424d96653a5fd/13396970470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+retrieve+files+from+a+broken+phonePDF link annotation
    • 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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 11000 bytes
SHA-256: 4d4750f17822735435a0137ee451a6add95314a97094b071e52a5f36214d0163
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 19744 bytes
SHA-256: 0ae7951380ff9f3236f5fe069b8abfda8b7ef05ff191bfb101a349bfc9e23a92

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