Malicious PDF — malware analysis report

Static analysis result for SHA-256 89177194cd70e7c2…

MALICIOUS

PDF

97.6 KB Created: 2021-07-20 21:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c0a719c474a0f2b806f9d27c9ec269b SHA-1: 3a0c02864012c374a09a19a0c797e790ed560ad5 SHA-256: 89177194cd70e7c25b7da1178e245b389e9037a8b8374a2dc97e8187aade8cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://study4student.com/cache/fck_files/file/2719131803.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1667e71f0e---waxugagipozefav.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210716_E92EA7ACAFEF3941.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077675438e54---50863554781.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b8d68cdd485b9eb121487b35034730b9/silegofisaxe.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/28614837783.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e79eea363---datefinak.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f07b94bf---28165416581.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/takilolifakosizezipub.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/torobomapumumukeza.pdfIn PDF document text
    • https://wineart.online/userfiles/file/82789385071.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b5ca3be688ec5bc3ff849116540c9533/3555595829.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160988429693ab---98075596725.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/541c53249a6c92c7aa18e1a683d24a63/tadidibexobupuzaz.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/37825931059.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/27680133711.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762527584ee---guregebu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c5f076c5---57727523106.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/sejaveman.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/medirizotipaw.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/milemekixudarigi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/90475388aa389ddebff0027b950f3625/39929084236.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/nafafuvatuwosetamavetubup.pdfIn PDF document text
    • http://screen.by/images/file/lusezupipuxolenazo.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/85168215277.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/taliwifupolurokole.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/e2cmomj7qhpu460ovup845an51/rasixopogojavidirava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hollow+knight+grimmchild+charmPDF 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_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 17012 bytes
SHA-256: 95db9c300d910b16eb6355b29b1466073b896679962322b0a5ee833d1bae1623
font_01_sfnt_off000148d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D7 10684 bytes
SHA-256: da5349147eeac88127e3b4367d9ef139c16aa1425719acf231d31e09c1de7240
font_02_sfnt_off000160ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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