Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2870db24ef22252…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 11:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bdfb24d815387bf60b94e1ddeb8a8f0 SHA-1: b64680356c5b45abb8afc27e198d9338358715f0 SHA-256: b2870db24ef222529daf05e4c647a4f2adfcc3fd9003630ffdcbbcf83b8fb138
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting it's designed to lead users to malicious content. The presence of numerous URLs indicates a link farm attack pattern, likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=medicare+claims+processing+manual+chapter+23+2018 PDF link annotation
    • http://cornucopiafrederick.com/uploads/files/zexusisegedo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49b49f1db23b76e037c45ed371991ffa/49185272108.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/saveseratiwigezivogibun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd9b8a45d---49288895503.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/kuwemisakuxefi.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/88994112264.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/78703617623.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/31155865339.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5b351e51c---rozep.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n6rfgbu7b5182qvk80frclen9u/jigejagazuxokizo.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/filukituwanumadefinipi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/jozojajabela.pdfIn PDF document text
    • http://novichiha.ru/pic/file/dojobizesowukevebofosem.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e8e29aaf0648c2db6c9c2de696bcdbc4/babimuzogemekinupus.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd959cd29---7824641238.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/pudakeromubupizimilimo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tq4mg1np5j1ko4j7ote0pbk28o/sejefasiparuramer.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f187e52ca11---28874973117.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc23188ad34---59352313207.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13627719e3---40835519028.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/34229230077.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 17668 bytes
SHA-256: 937a2552b6c126c7a28f5fc43c9a87dc3ee06f445c3a966d3575a0ab971a0f12
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11728 bytes
SHA-256: 0f6ca4bbe9dbe476733dc7170da1415edd8d854136889c584cde938ba96ff2d5
font_02_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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