Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d438665c9a908d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 10:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa1f16cef75e073e21539b18198f8a7b SHA-1: 155aec009a02acf951375b54947f4b434fb37e92 SHA-256: 03d438665c9a908d174bf7c86357df5d1e582190f947a60b10845211aa32a11b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous external PDF files, many hosted on potentially compromised CMS uploads. The document body is unreadable, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/6355278652.pdf In PDF document text
    • http://abwingsjanaf.com/uploads/files/2687195968.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210522220258199.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca0d5138---xegaboxegovo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a892cfacd39---7785408892.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bosed.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/juvufovodisov.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/22802800137.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b5e4803b---26901949127.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/44739546830.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/2647596215.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/26274316985.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/nujogokuvutiwazaxe.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/novil.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/df05e1987af7439c87046fca400d6962/45481098803.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f659864e60b---jiduv.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///89866285758.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/83028484039.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9fad2d7b---61033196992.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dd4fb9n4fga80simgu7lpl9o93/vurotirabobaxubim.pdfIn PDF document text
    • https://sinarwaja.com/account/files/47061579996.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/40218164064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nostalgia+cotton+candy+machine+not+workingPDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 17652 bytes
SHA-256: e3136972df7194b6a7d9898cbad17242b8beca59d780dede991f88f5d93a188d
font_02_sfnt_off000134bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BD 11088 bytes
SHA-256: 2d9f4a897b5cdfe225592db241458103e2db4ad02d964eab68822bee409ff72e