Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c55b75948ff2e76…

MALICIOUS

PDF

91.4 KB Created: 2021-08-26 12:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52b14eae82d6418b62e669f0c2d38e84 SHA-1: 080994faa08c6322c010ad2f00bcbf8fc49b75b8 SHA-256: 2c55b75948ff2e76083ecc7e0c5f766c101bdbbe2fd3a492d2cc79f118c7e6db
164 Risk Score

Malware Insights

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

The sample is a PDF that contains a link farm pointing to multiple compromised WordPress sites. These sites host further PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ae2738871---31036287764.pdf In PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/gosevebumozex.pdfIn PDF document text
    • http://splogservice.ru/content/file/nomixezar.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/tosesanobalipabasid.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/38455446637.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d3d67dc---lofotirujoduror.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983877334f6---41905100007.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db1337e0b---mevanebubila.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7894187179c42f9f0bf4e156e40f335f/96625802977.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tozugixubopanefimoven.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7a21ed8f---parekuren.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116b003020db---8995403350.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644d82a1df---73111209137.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e6ad35484c7bf0fc6503149f2d2d4119/tekoxagifisuge.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/37149475468.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/72372461862.pdfIn PDF document text
    • https://epiphanych.com/images/file/rixivukaxopomivijiriniviz.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/35459891661.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fowutaledejidanuvesovak.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sumevojijosizuxipazowat.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e6cc6bc3d639868c6e2a891b2a2936a1/88827219113.pdfIn PDF document text
    • https://digireg.se/upload/fufumefugudulatawasi.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/d9cdc91143e18d3da1039c2db63fe38e/dexufosep.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/zodadimitudasujofofoj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdd2642f86adce1d50074ec4847f63ec/54641281795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+pull+a+muscle+behind+your+kneePDF 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_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 11160 bytes
SHA-256: 9f848582ab4289097b815c8054ff4c1abe726292a19699914b017c38294bbf0e
font_01_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 18420 bytes
SHA-256: 1a855797cf52c292d5898c2636ab737098ce7669d52efe5246765e1da1290bc8
font_02_sfnt_off00014778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1