Malicious PDF — malware analysis report

Static analysis result for SHA-256 353afb6a2023f84f…

MALICIOUS

PDF

74.4 KB Created: 2021-07-21 21:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ddae41fb6a14484b840dc9d32df8cc0 SHA-1: aaa12bcf4796cd425751b342ac1625872a7249c6 SHA-256: 353afb6a2023f84f59740364473cf4b456e219b05ac4098a4f193a92719b2180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bleikss.com/userfiles/file/fubitopiwexe.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e27c5bc5417df0d5f5917001479e8ff7/muvuwojegiworukimamil.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607371ef5200b---bovozumizetevuvowuradajep.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bogovopudakapoz.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5965540a3---27811185897.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bc8b89032---39199281789.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/17294550317.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/55622063248.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087231775e3f---57590298108.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/ramufikubomazemufakifose.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/5mm4eloeiakdta6puriqacsds3/sutezulab.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/94056170775.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e570c25e6---48618711925.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/56173705964.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/64102002731.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ef24e081---33763424394.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/pisexumomeraguzad.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/pixosidezapamivuzenore.pdfIn PDF document text
    • http://momsystem.ru/public/file/sopijotaku.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/24518741493.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eda3d9d36---povodazedakezalasa.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/60d00a8594e9f4ef87232d73461f1688/69099033087.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/vimefogirarede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=todd+galberth+you+are+my+strengthPDF 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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 10920 bytes
SHA-256: 72e0acc0a751977b331be24c65c9440f5ae5d69414e132d74849eba105c69bad
font_01_sfnt_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 16248 bytes
SHA-256: d2a3cbf028f4618fb82aef9ae319b1263ce88cfd358ca8f0a835a0e642346202
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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