Malicious PDF — malware analysis report

Static analysis result for SHA-256 58579228cedc7e1d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-21 04:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dc85c2a83e05c2dc77d5b47949253bdc SHA-1: 9316582c3a2a93389c084c7bd590a60d9fdf6b72 SHA-256: 58579228cedc7e1db24eea7284e45e4d7a97a8a1101a91d4cb9497fd772e2287
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://broadviewlibrary.org/uploaded_bvlib/file/28942347848.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e45b694159b---66674771044.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0cd7229cf2dfdaf603a2d0a8bee7983d/12380644540.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/pidaleguratema.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/sotewezidur.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hk6tf32gdnft8fomo5ch4j9tqt/faruzodukuvaxupujegupu.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/tirefet.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0563ce1cc1---muviziwezivitobojujo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c855a9c7c0---64796590634.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/5781023181.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/zixupovinefiwemetalutifep.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/86cd13c7be5b3fd30184e6d65a96d04f/55482056277.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42b7e2450---39837931236.pdfIn PDF document text
    • https://yodobashi-church.com/45992496229.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3365d1b5---28238091151.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/49020488669.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/db85bd029f066bb244e6e194341bded1/57222944369.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/padidasiz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76d150667---97194845021.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/56496385931.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/17447326291.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/deaf3cc13b9d3470cb20642ebba1d829/77154704440.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cebc0292d7---17406650717.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/43058713695.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/703fea273fd19a14e5c50bf76e6f65b0/kewovugotitenisoxewivoxov.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/rbe7o75eq29s0r1rg860etm69d/daxojapulododivivomoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+automotive+repair+invoice+templatePDF 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_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 10512 bytes
SHA-256: 82ebee4d6cbd44976bfc0dacd2b8fef8f17e304dbbba2cc04164e41e9936cd7b
font_01_sfnt_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16552 bytes
SHA-256: 61b0683ded0538233dc981c99387fe180a1aa0574a4e14f3bce79643f0f0290e
font_02_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1