Malicious PDF — malware analysis report

Static analysis result for SHA-256 856a9adca4f30c22…

MALICIOUS

PDF

179.9 KB Created: 2021-07-03 17:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16fe74834bbe1856d6aedcd6b193fe29 SHA-1: da28aa815e1ceb18f27cd1a71ba71d8fcf3dfa92 SHA-256: 856a9adca4f30c22d6e1f901e75e5eb5563a614b9907e4eb619a4df779c6a9cd
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

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://garnet-medical.com/userfiles/files/86664979741.pdf In PDF document text
    • https://trexanh.net/upload/files/vizimajezewedorusuba.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9ee5e548---xinufekakaguref.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/7762661368.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/fafegudit.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4f5482d1---28135510144.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61567748449.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q3r647qs9tsevbjhujnb35lut7/namase.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/penidijigekemujup.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c320827b2c5---4255589555.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7evgumdala8vgeu1tdtl9tddk5/79717779424.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/rezuv.pdfIn PDF document text
    • https://irantruck.ir/data/file/57076179434.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/loxeronirafi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607093b131404---47685705111.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/85c7ae81a89cc618b38c6aedae1aae2d/53240410689.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/199325108.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qhslf3mhqon4dpc5a9opgdam20/38489182788.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ec6d5cca---27659495232.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c916a6178fa---posujixotuvazowanu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0d6cb14f3afe3478da64f77e247d2195/wokewuxofulaxumafoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=activated+carbon+from+coconut+shell+project+report+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000256e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256E4 22024 bytes
SHA-256: 7eb74fdfe1eebceebd43b3e3d47e883cb24db9e13441afaf181523483469ab11
font_02_sfnt_off00028df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DF8 16992 bytes
SHA-256: bb20a449173098bef4ef83b644b595b4ec46ed744dc73df7ed40696985f03e68
font_03_sfnt_off0002a6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6F0 11304 bytes
SHA-256: 1a38e9e6c9311f634415d1503b74aea4bc505538cd42815d2dbadcca0567d7a4

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