Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46ea557b54fdbd0…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 11:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d313e92e142dbb98235e183bc7bb43 SHA-1: 2f44e6970ffdbb31b748b3f010a3199b29a6b218 SHA-256: b46ea557b54fdbd0481660a065070252e042a525bed7a9324a836db6579f9f47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=intentions+justin+bieber+mp3+free+download
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/52cf0fa3903bbdc1353a453a4b79f782/vodiworuwabi.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f31d5e477420065b7d21ee8448848a0b/40833441353.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609838f7517cf---79344219444.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/cbuj5reh79coqkdcq2g9p3dku2/57930046944.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbe9ce0f0---701448639.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7f9c74e---16083084590.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff88ca6e6e---15190981396.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094482d5cd5b---favagazux.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c112a1ffa1---koxisajotejaxefufomo.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f720702fc2759913a0a2f2fdca13497a/17398993635.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/a71sp893g1ps1frkr9q6lcnh51/katesubebanovipu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd100f320---tavigipubaliwewekifa.pdf
    • https://triosms.com/userfiles/file/37785329535.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/fab05sq9jaoa45haoaooeo0tk4/59890483824.pdf
    • https://kasihpaham.com/contents//files/vexix.pdf
    • https://trexanh.net/upload/files/jexubodaxajit.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/205fcc074d21fe1d6841749345b4070d/zatinax.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/db85bd029f066bb244e6e194341bded1/57222944369.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04a631c3c---9102020168.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609105a909191---63447504305.pdf
    • http://acecaalcoy.com/userfiles/file/xibepuxaluju.pdf
    • https://beautyyaurient.com/editor_upload/file/bufodavaven.pdf
    • https://wrd13.com/force/file/giwafelobezogafowuwafosa.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba438f6e254---kixurazovaposasusuxa.pdf
    • http://robalton.es/Albums/images/file///93596611956.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9975f43e52---1806435044.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbde.bin
06747095019281e835f78238c01696612d9d0c91192529ad05e978745dcb0c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 11236 bytes
font_01_sfnt_off0000e608.bin
193600226adbd2780ff1fefada2d0ac7a1d4294c2d4273f5bf23d6f4fc1584ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 18508 bytes
font_02_sfnt_off0001157a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16792 bytes
font_03_sfnt_off00012d8b.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8B 16092 bytes

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