Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afcf611071d9e85…

MALICIOUS

PDF

94.1 KB Created: 2021-07-07 08:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f79b05b2d556fd57a66a42ebd1be0c86 SHA-1: 935e205502d3839843719535bb0d6201fbccd989 SHA-256: 0afcf611071d9e8501b3c2676553afcdfc21158ac88dab81512cf2326baac2b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to lead users to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098636cb9cb0---99183323335.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/419vcfg0ltet57p0c7fstmq74j/8219583171.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a73e2dad---nolebofab.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a9b36e60a---xurezexedoju.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/n8m3o80s8tcu6su13rg2u8chph/89757341449.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e2fcc889847aa6c4bcae31a295e945ae/fopamiwi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sizabapamarifajomotarom.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f7a6f3dd---wutonukegaxakoxavigudiwo.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/jovuzekunowuj.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/28704619421.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/32534710173.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/pusaxuja.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/47868675291.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7c4832e7---57851556562.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/43977124038.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd02ae1d8ae---panogeraber.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/71193512365.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bad46f46326---6276890847.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0e357831---40488652886.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db53610498---wowes.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b58896d---vulukoja.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p14214ebba3v3ppjjgo2r93r21/wezuwobumomi.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tijixovogarebamotefarabaw.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/lusidavipanazutikiferezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+edit+pdf+file+in+adobe+reader+9PDF 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_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 17204 bytes
SHA-256: 23cccf36d058d2bd4442c5362efa80925a851dc2ee3985d66b00bfc49bc1c36a
font_01_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 10708 bytes
SHA-256: 2afd2d7b5c0f8284c9c4bfd0d8991b7a0cdbc6118c26be865ae03d2646d8358e
font_02_sfnt_off00015306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1