Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f51831351df497…

MALICIOUS

PDF

82.0 KB Created: 2021-07-24 05:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90d7a22f69137aa48f2b9bcdf9d14b5a SHA-1: b982bb7432152da98e7760ebe9e3cce0d5e75c33 SHA-256: d7f51831351df497ea2c23c39484090687a7dcfd83338e25984e977b5f512b0e
176 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress installations and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a0pd3gmdmqtgn5dpptu7p3u3is/65017884431.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/73302938809.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nmi7l1ed13igjrc9ba1oi9f1hd/3579066070.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/lefiludugujipubifetuvegi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072008f3d873---mikubolikevog.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/zowosalapamevizoda.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff052c252c---53737878079.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/64421106415.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2160643fe8---gusojukizepeza.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/74909203938.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c3387ceb---28282403979.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/xokitijugulatusabozipar.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pigki7luf6c3o9mudoaa3mp1ss/8672916618.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/xulukurazigelofagifutono.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tenaxin.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/6818282681.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736720358dc---64180460996.pdfPDF link annotation
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd59fc4c80---raxifefopafofinuruxawon.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/70724203663.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14103606266.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f0c271ac6ff4a1ed2c475b5931a5e581/somuzoz.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/24508007603.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9863eb8136d564aebfed1558b464742f/61777965813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=trapalh%C3%B5es+o+auto+da+compadecidaPDF 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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 18612 bytes
SHA-256: e514f76aae436011d539fa4388276aeea50b3c77dbcfe378d25e4629c76b0818
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F85 10964 bytes
SHA-256: 9fa98f2964ff6c903df3b16854d612cc8bbdc30e92bfa7b87534f4668f416b0d