Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7696f4f1a1de403…

MALICIOUS

PDF

76.2 KB Created: 2021-08-22 03:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d788f83deae45247bc1edcf3e49fd7e3 SHA-1: 37dae20a4330f828ffde73d17683b7448dc9d404 SHA-256: a7696f4f1a1de403a6ffb65f0eaa66a1536436e8ea8c7da516fb6b5b4bddb0ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=physical+pharmaceutics+2+pv+book+pdf+download PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9jcgsido1p8a3cp0hcmadpg1d5/pesekefuwoloxaj.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/91449615845.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6bct5g6eeghavpapiu2k2f5nl2/48399314649.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e201f2ba---87260590397.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/dowizoli.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e76af78b---ralubapokekusimezipuda.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/6296008370.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/dibiruzerat.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/ruguxulelokupisogu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pk7oi1ln1am60ade9o7g2gktgr/lokitubunifaguwifutam.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/90335900348.pdfIn PDF document text
    • https://kuepancong.com/contents//files/43174584272.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/27201343216.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1a2b7d3cf---tabegojoworakobasaranuke.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/43e3d606c8b99c5e63ac56d97cba50e9/giratidivisawivo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/waxumazubobanosuzovilox.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/9805081008.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/donidasorifib.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/24799176172.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/97777145667.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df996478dd---nanoborilanal.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jadaxoruwulonoxopemivi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86cd6c2cf---26261373759.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afadb46d87e---sogogazigonefasosupami.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/10524230186.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1ed99148b0ede5274aafbcbfe1aeaed7/79542823331.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://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_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 16300 bytes
SHA-256: 4539c88633c488bab768682b537756c17f26585c871227f14f177726776bc261
font_01_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 11604 bytes
SHA-256: 3300bc64560a92cbcaffb1fba6b4b44976a1e9edd4bd0dace68e805fe461d508

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