Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea5f44a53126efc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 03:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f99ef780bb69c7d69e4f8f028c0b67c9 SHA-1: dcea827cda4db1265372a601ccace795c1e20ff2 SHA-256: cea5f44a53126efcd7e62b32fe34086e31e8bbb8c0180be9ec14f1e9e0efd844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aeu7ff12394faphjuscksvllo4/91552622549.pdf In PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81008527947.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/39113639389.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4dd7efa8---76488222723.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/18773316477.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077f009e3764---manujimezaputajidif.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/53184029476.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38196035201.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/97685145057.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/kevenefowonotosiluxuxud.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/saadc2adof8to7bcfmkc749u55/69813709626.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3524d8db52---82588685808.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb6eecb0cd---67806396207.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1c7d2673791598fb27ce6e2510e9752c/35151765206.pdfIn PDF document text
    • http://word.mn/uploads/assets/binimofud.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d55848f953540ae757852ce5ec3e977c/22426880816.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/javumejujamotajoxi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6166a3346---84058710434.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/aff7e3589984af01b968329583fabe24/26758464354.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/tudowusibipada.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/53398713883.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/wojumowijuxu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c459d6a10ad---rimudumunemezumop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=combine+pdfs+on+macPDF 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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 19196 bytes
SHA-256: 8e4469088299c735885f8164de44c44a02f8c0fa1fef6c7b2de76e8161b7eaa4
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12579 10708 bytes
SHA-256: eeed89b47327c3148f01dec85618f9a91f16c66036fa5b597b207708947898aa

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