Malicious PDF — malware analysis report

Static analysis result for SHA-256 65707afd7225e593…

MALICIOUS

PDF

103.2 KB Created: 2021-07-05 10:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f1e4be15f811abdf75d3f70a65d5cf SHA-1: abfe4b5cf145dcd67caacb65a366cf2b5581554d SHA-256: 65707afd7225e5936ca4fb35a43660d09b3e9448ff42f233d7155897259bddc5
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, some of which host further PDFs. This behavior is indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature, with the primary goal appearing to be directing users to malicious content.

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/soup7ac7t1rehnai97vqd3j2b2/xananalometedad.pdf
    • http://webhenevents.com/clients/868374/File/13669229840.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827e7255553---xinevabudasan.pdf
    • http://rydelko.pl/userfiles/file/10229398399.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736e70a3ef2---konokukirexutelakoxugus.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/92262669e9ff8597ff0efca1695b9e12/dobunane.pdf
    • http://phoiinnhiet.com/images/uploads/files/fiwilow.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021624622129215.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5727982e967e16db887c708917f7841c/fikafufubidimus.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160874b288427d---nizetorewit.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6cf5aff44---32988018710.pdf
    • http://delshadian.com/public/userfiles/file/22166832567.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/las1k6dv5bqcum62720vb68k80/minavuzakirawud.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626d6e43c8---gosamisisikibodokizogoj.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4b24b6d784894f543c9193d6e1fde8cd/55601903214.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rpinbr3es7q08o6dp5hi317l47/kubonakud.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/borodesuni.pdf
    • http://mtsskzy.com/userfiles/file/sotefe.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d945583d2e---76467473468.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gcjq48dkmmaar9f89e389asjvf/pinonaxexubazukolemum.pdf
    • http://netmutum.com/userfiles/file/numasofogavo.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e4f2add2---repitidem.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab720a64ddc---sisulebidosunib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=samsung+one+ui+icon+pack+apk
    • 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_off00012f26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
font_01_sfnt_off00014738.bin
f1c4e6e126549145499a0205b673347704f24cba905ceb58957c9a42bfaab5e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x14738 17552 bytes
font_02_sfnt_off00017531.bin
40e713e4f16507460b6f51a0bc8df467d8ef2f2b40e8d9d59a0abebb8f6d3901
pdf-font-stream PDF embedded font (sfnt) at offset 0x17531 10740 bytes