Malicious PDF — malware analysis report

Static analysis result for SHA-256 172c6e22ddce7aa1…

MALICIOUS

PDF

100.3 KB Created: 2021-07-02 01:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a49bbcd154ab3e4719c18ab1a98a51d SHA-1: 9f2a4f7707ee7e7d0f03122ed801c4691f74673e SHA-256: 172c6e22ddce7aa1a1f02f9402c0a9ddbbe54c4bc7c0cee20c70588122ae1c9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alfavit.tv/userfiles/file/99384693815.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca200110---biponor.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608099870d1ab---fovigo.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210506181432.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a247593a2c6---59579361984.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/49518411479.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade995c816d---60781701929.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hg8tf01fv5uthen3lmdh2me5fs/xakagiruros.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/gelagixa.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rabikek.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/83004324632.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22bb18564---69199813212.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608651da4671c---64048429365.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8dd6a02d---30041359292.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/lolikolorabitimomebamuvu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/bawetilogelemamepixofuk.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7fc30793ac2453f8e2d22db95697b4f7/gaxipe.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6d74ef3ce9735e8b45be02f020896e12/90132301263.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vrs7st7gs5r30i3ffdp7m0t7al/rabafebemutuzadeb.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/15383019470.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/3d7601a81c4ec10ac246b49b318fc4a5/totuwuwopasasadepumadetup.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/44640167645.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/42696133580.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db88dc9a4---54624239043.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dc37f40dc---57108234553.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/zozomaxapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nata+2019+question+paper+with+answersPDF 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_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 17244 bytes
SHA-256: 999ce166daa4d9f2a135ce7e1f2145a774aaf3d7dede8a8288cca9ed61934a27
font_01_sfnt_off00014ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF0 11076 bytes
SHA-256: ec64075cb2bd8c019e9b12f99aa160c5609e86baa06fb37a7989b76eb3412f95
font_02_sfnt_off000169d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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