Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c41b4a0ac6b209f…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 09:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d146350d43c6e99c4cbcba52082e392e SHA-1: a9f5fbe33659e2ad23632b80a8f43d6a3104aef1 SHA-256: 5c41b4a0ac6b209f71cd2a9ac617207d6f9b3aeeee36db482e646e9548432903
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary attack pattern being the exploitation of users through deceptive links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://nomylo.ru/uplcv?utm_term=chevrolet+aveo+ls+2005+manual PDF link annotation
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32835000648.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/84775384829.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772217625d6---wufuxotilavopew.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160979cbbeeedb---73931302968.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/penox.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e99df09b2d473197403a88158401991e/xamatovidipano.pdfIn PDF document text
    • https://loctra.net/userfiles/file/38047250532.pdfIn PDF document text
    • http://museeducuir.org/upload/files/94133008556.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/59370563559.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/kagololubozuwal.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/32869589941.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/78342415465.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611497cf2ddfe---wisewegagep.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161149f8abcd50---84659002600.pdfIn PDF document text
    • http://abpaluso.com/upload/file/44629581737.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b4cdd6accfd6901f3ef3259e6a93dc4b/54309856991.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/9059441481.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/firilawer.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pezamarizamotojusatu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gr8r6lg81kesaun4l3eadrej8r/3414809487.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/fexetajovejomax.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97ac9e017---fozirixib.pdfIn PDF document text
    • 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_off0000c1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AA 16396 bytes
SHA-256: abb1c5212c7480bf28b15a10519ae854fbeb9c662d095143ba48a910f5b7d4ab
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 10856 bytes
SHA-256: 49e9abc7aeaa9155dcc543033d6b9f411f10bfa09300175a620713d49671bb0f
font_02_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 22212 bytes
SHA-256: 93d059437b34a127103169b29fc80a1b636a035993bee1fa2910f73be420919a
font_03_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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