Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ac41d0e9fbd7e8…

MALICIOUS

PDF

91.1 KB Created: 2021-07-16 17:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f94c72d78b35b6a1f84add9356713837 SHA-1: fe3d66f98e9a3e6f7874441a7bf1847129e5b14b SHA-256: f9ac41d0e9fbd7e87469943ef29db92348d16c140f766be26c615e39da0eff5a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristics and URL analysis point to a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://airholic.com/UpFiles/WebEditorFiles/file/65812405003.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c62efcab8550756c58354cea59daed71/64724280658.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/debifabuvigemimovib.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/8957569363.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/32257937822.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1a3557df7d5bf52873de6df3798bd390/xaziwavifumirokusix.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a521ae43a---rupalerisopolakafem.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6b4e1be8---66638431035.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60C5B07BEBDF6.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/vigifuweroziwesoji.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/wudujogarenaboreze.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab59cc31d0---ganidetisepowasajapamovow.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252147e052---33176907726.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3bf5c662a033750bec7596aa838999ed/guzuterubaxek.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zobatepegetovitevoxanupa.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/12db9c18515b23d814779f77dcc1140a/jesel.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/49899c74d221d4430f0326888eb85655/wevexifefejetipaforivuve.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/745e5bea8dfea247e57b667f30cb0cde/nazisi.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a34cdd02e03313f1d68e79e064371ed0/gubavizub.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3p84j04q1s9mt1is3jn6gkvoje/nudapapexowil.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e184cb1b---80471557599.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d72376551---57625782249.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/wilesimawakemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=steam+validation+rejected+cs+1.6+dedicated+serverPDF 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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16864 bytes
SHA-256: 49f5458336583febc2258a529715d0a85242c82177818cd2d42a802c7d57a7b2
font_03_sfnt_off000145c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C8 11088 bytes
SHA-256: daac6d5fa2de1322e505a0833680ed48da193d4d9bafe94b797822583eb4f7cb

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