Malicious PDF — malware analysis report

Static analysis result for SHA-256 291d531908e3c6dc…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 02:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3865830236db8c12aa6c184e9500f326 SHA-1: 4d58ee5c14dd98037e325098442130dadb3a945c SHA-256: 291d531908e3c6dc09a9356df60a61b56b75c4ea6d47d1879222ae8a546617e5
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating phishing and trojan behavior. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing destinations. The presence of these links and the overall structure strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=postgres+select+from+multiple+tables
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b94b835b01508e553802c98075ecd552/xepofigifozefos.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/buzojojibeponatol.pdf
    • https://africanresearchcenter.com/userfiles/file/baxukumixesotesesurejojo.pdf
    • http://jinanxintiandi.com/userfiles/files/74317273638.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46dc72371---15312301336.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d63344986---82320934359.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/nabuxosoxujarut.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a1349535a---3956970381.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4d32881cdec72ef765ff8aa17c490bbd/41026425359.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba43e2dfa40---panigewasegaxujon.pdf
    • http://cn-biyoute.com/d/files/58341747080.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/161f4983d2c4db95026729977f47c673/12669513017.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ce35a02b64252668bc83254cb124377d/12604366389.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0b202e2b---nogunewejoguxi.pdf
    • http://ozkayalartrans.com/userfiles/file/29869834790.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf7e3a043---zezeliwini.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5tmrns41qsa7cl42m1uhjl5so3/xuxebi.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608420e9273a5---bisusenatijejufalizu.pdf
    • http://anhbanglaw.com/userfiles/file/minugepi.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e2e25e93338ca0809b0d075976afe365/firagok.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609be124dc5a6---tewukapa.pdf
    • http://satakantaresort.com/user_img/files/wevepivawoxasezum.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/tepesudopurilifuzowisaduf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ff.bin
d38b33af67aefb4dbc5620224f95cb71bfca079cf032f91624bfdd1daf2bd5d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 10960 bytes
font_01_sfnt_off00010c4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 16792 bytes
font_02_sfnt_off0001245f.bin
dd8dc57c331f8e3857a99204f26b77aea1c90dbf885626e2f2b076cec2731c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 18412 bytes