Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84fb4ee68f25018…

MALICIOUS

PDF

87.2 KB Created: 2021-08-04 09:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a67c6405d318881f2ab0d2c3880a8e33 SHA-1: 069e8cc332ff1fd8b8a9274314781a60f2869cf3 SHA-256: e84fb4ee68f250185a51f7f22cf5b60c2a1fd1cdd9e4453fbbfa39eed871076c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this, indicating the document's purpose is to redirect users to potentially harmful or deceptive content. No scripts were extracted, but the structure and URL patterns are consistent with phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc353bb4d---gojoresadafumotivat.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb160ca2d9---zurezuzipazosutiraba.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa89c44e4---60030775128.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/86078568092.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/depeketimijivuwobu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ea543528c---melegolijope.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160faf63d16535---13510432217.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609954bc20b3f---69960726552.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/21625309477.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1349e96c---pured.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/98950078656.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0b5a800446736d022bd827c0fdbae28b/57304634826.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/9460358792.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966da9bb5b4---tekarewafelodixux.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc1ab34e30374ae3f713134cf3ce07b/60018876086.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/65018777695.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/idgm851ejv3ne6oa60ev3bjvvf/gobatubemow.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210619011322.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/de007386e585e234c32ee3f1ab33edde/25098694740.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ee044feb6593a9b10bbdcff08ef677b/68490320743.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608367745ae7e---tebuvi.pdfIn PDF document text
    • http://benetalent.com/upload/files/54733148888.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a3c41814---33891526907.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2b479e9986c49c5f23570258858b6aa0/bulobimeviralefajuvafid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+reset+a+maytag+bravos+washing+machinePDF 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_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17140 bytes
SHA-256: f1e896a7d54f41b11b01642b0ae0b6d6646a61e8c9fe3cc8ef9d3c6d2fd95ee8
font_01_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 11028 bytes
SHA-256: 1292e63d9c4bf175fa0177c25ee0439cda8f28fc1f9bbf4e93da224fe2e6756b

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