Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a7eff218b9b78a…

MALICIOUS

PDF

76.6 KB Created: 2021-08-27 23:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c9a38e62f4b9393772f2941b089fa44 SHA-1: 1fc577357cb2f7373a83fc63321f85e0cdb1fe24 SHA-256: f7a7eff218b9b78a2d0858e990c5b61cdcf973765f8337de6867c22ebac159ed
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Static analysis revealed numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://pistant.ru/uplcv?utm_term=dimapur+in+which+state PDF link annotation
    • https://vntdc.com/upload/fck/file/rukadirabakowixozozixus.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/zakotuxudo.pdfIn PDF document text
    • http://aweibel.com/Photo/file/dapabazeradasanunebobet.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/32841095351.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/21888820393.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758228b26e---nukagugotanali.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/14601916789.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bedbebb2cbe93f3c84cc24eaceb921b6/pejebopew.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/91175654034.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///wasasoraragasixiru.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/tabonizebepifamulesunim.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/kutogi.pdfIn PDF document text
    • http://xtra360.net/campannas/file/zowasijiferatagizug.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/bamititanumikivusenudaku.pdfIn PDF document text
    • https://fishboat.hr/files/1872619599.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5148f454a8---siluxudalovukowaz.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/38781740297.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c4339a21---60775410129.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/63593461130.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/5311830503.pdfIn PDF document text
    • http://teifsepahan.com/files/file/83789522687.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/82939653328.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/ginefi.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/2279995856.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/40849185a0550e2393256cbbcc80a916/96445172531.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/92b6fdf9c6ddee090cd5af8ce1410606/levemiko.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_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 17160 bytes
SHA-256: 6c4876532956b5c12c1fc9dd1cf28a7ea9ffb84d62ed977e83d94599554d4bb4
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 10660 bytes
SHA-256: a067cb6e5b050d8096095e20365fef8d5c823703bd323ca2b15cdf6d8788f52a