Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1d7996d40e1a90…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 21:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fc5a8359cc197a2735574a72fb5fb63 SHA-1: aa21df5a473d271f245b230691193f14fde8d9f3 SHA-256: 3f1d7996d40e1a900d1365aba16fde1bd77953c4625a90453a03b539f4ebd26a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607912ab1be31---60366585079.pdf In PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cc2b2393b---67266036277.pdfIn PDF document text
    • https://termoformat.md/img/files/pusozubodiwipo.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xutivupidonej.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/21279604579.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e24dbe657e---gakewikudakufawurabofa.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fenaremejaranomudurur.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160781512236af---38836527693.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/aa3605200544a62880691b0ae5c53839/14826567380.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/fodubakewaredav.pdfIn PDF document text
    • https://best-label.com/upload/files/tefuki.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/3fc5fu4eqpqlu5a00kral72l88/8404511110.pdfIn PDF document text
    • https://ahha.az/userfiles/file/jazekokumosuzuvominememi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf591099e6c---74835604307.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1e014a6df956a8643dd8f9ad12687f2/lafiwefipamajisulixob.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/55961255073.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/mibajuduxamojapazozasal.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6379241437.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210624_184230.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/u1kpe9t91au3livuubhpkcsbi7/10101201891.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6dv7r3vmfsm5v9kdnbqekb5sl/5902138320.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160722276b653f---25077128777.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fe696e53e---korifirikisakururemetu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/523vohjdcn25uik1tmb8o4sae3/81248605979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+maximum+dissolved+oxygen+in+waterPDF 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 17616 bytes
SHA-256: 24bd54eed3dd40e191176d3b297ad590f90f1976518a247d5b1f32d5a125bb93
font_02_sfnt_off0001353d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353D 11156 bytes
SHA-256: 6c8c74b403f0d8c8f2a0f27010139526f4c8237b1bbefe8eae0d51dfe40d5792