Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e81edcdc125e38f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 14:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b96b8bbedb37c96eaa7e1c1443398a75 SHA-1: 8edf23923660b9f526f0e15ebefeadb2f41e77ed SHA-256: 3e81edcdc125e38f389651530616598162b894c1ce8ac80a5c0efe538425c5a6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cowichanseniors.ca/userfiles/file/38635880897.pdf In PDF document text
    • http://reginahajo.hu/_user/file/15179005813.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/55392876652.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e896aa6a11---43576983119.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/juboweraxaridotuk.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a2bf7ce5701ac97dfa75320b0d7849f7/bovanewidopesesilof.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/21740533371.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/97226449260.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/49793318684.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/789e4188d941a824655b6937e468f9d3/7434823151.pdfIn PDF document text
    • https://kawanmto.com/contents//files/73292642778.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/92032639997.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/baxiwufutubepeju.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/156t6o8skqa13j604l2na92qfj/nezekagoxebakikiwefom.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/fepibewa.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/jexupoxejavomenoku.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3fc4a0547856551baaab82ec34855b1f/nalosowekefowinux.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9e7482a2cb02cc746acb7ab20147abfb/xunonudujadur.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a7b3a4b374e42919d18bbea60c2a0ed2/91759736309.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/mn76kf7c66mpinibquie91aba9/76956550185.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc4d52a22---80716112327.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f1ef9eb210e45f994ff7197c26ce1ef8/muwotunulileketove.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/nenumo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/53503142807.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/66730379363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=english+grammar+test+mixed+tenses+exercises+pdfPDF 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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 17540 bytes
SHA-256: 02597c857ec462344e6c7c04d81205157270b07434a30f9b9991e1e4509a5f84
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 11032 bytes
SHA-256: a880b2ff16ae7e25eb3e173374a7a77b0c9676affd83e1e21a1ca880cb6fe54d
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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