Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b44b7ed96fd5de…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 19:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d41db7bbf9138ae3ccaa6e7fb70c9698 SHA-1: 34efd516d9f08f763abd82b02b195c8299ce6eb6 SHA-256: f2b44b7ed96fd5de5ea0f501ef6c87ac7a28efc6d32ba4ae47e4a943bc67acdd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=bloodshot+eyes+in+the+morning PDF link annotation
    • https://truckforceone.com/upload/editor/file/98280371156.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gatopazimuzoxoto.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/72964247042.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_16_22_13_9020.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161494ffd3fe34---96861111970.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/rinilajuniraru.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/68067528820.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/57936024040.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/vigizowelibaseboxa.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94432bbf2---mazoferudare.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/6405111867.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/29439118345.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/towotome.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/5196828356.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141fcb027837---99439629536.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091304102073.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/86234821946.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140385395101---monobatemidafuno.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/jovetubopin.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/38279022970.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/67229761556.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/86768163589.pdfIn PDF document text
    • http://www-a.euro-ex.net/images/blog/file/bugonajunamoxedow.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53102082234.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/79663316182.pdfIn PDF document text
    • 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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 17256 bytes
SHA-256: 3902b29116037ce50f599bcf1d73157b9482321a96761c74326b41ff6e963900
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10700 bytes
SHA-256: 6bace9864937c8a8f6eb65afc741606241c8c23f685e54a13f3e901b4aa913be
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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