Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c917359a4683dc…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 19:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b107bd1861983e780bf583de261e4a2 SHA-1: 0c2ee00d9cd796a039a08c1298e80ffa1247082d SHA-256: 31c917359a4683dc26b646f323d67d10856761d9e44e1637a1e166533c6bd97b
156 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. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365816a1c73---nasununinidutom.pdf In PDF document text
    • http://apartmany.cucoriedka.sk/data/files/51062233303.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/69072082465.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/tomiladuwenutosemuz.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/rupet.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/65853027283.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0924/49a07c2d76076a132c30aaba30c93d93.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vigejumisanet.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/polezopujevedog.pdfIn PDF document text
    • http://esangsok.com/upfile/files/64809443079.pdfIn PDF document text
    • http://thecuriosityshot.com/jisipe.pdfIn PDF document text
    • http://katachizu.com/img/news/files/3686194166.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/koxazibilipe.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a4c169bdf144f6463962f99819447d7c/82844477867.pdfIn PDF document text
    • http://deltools.com/userfiles/file/ziguvidalorudux.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zubovupev.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/38327950053.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/53020235571.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/bikagemaramur.pdfIn PDF document text
    • http://trevorhannant.com/liwumowup.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/levogogewifexo.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/67895380283.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def0dbb9d4---16825870296.pdfIn PDF document text
    • http://rayanchem.com/d/files/rulisel.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/99198209025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=elite+dangerous+fighting+shipsPDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16324 bytes
SHA-256: 6523fc826d3cf5b96f849ba01365ac99235a6756693941b889f58f1301a3dd0e
font_01_sfnt_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10860 bytes
SHA-256: d789b17de486646b2643f4f36203fcbae91fbeba459770d6dca26df16e77fbe0
font_02_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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