Malicious PDF — malware analysis report

Static analysis result for SHA-256 d981420eb14fe9e5…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 09:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d556f34673fca1051d2b8cd5b1fa41ca SHA-1: a678a30b273e060bfcd55500c7a1144184461b2f SHA-256: d981420eb14fe9e55b47e08045be93b33585c6d0c9d37bad2fdabd3fb9432ebe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dostavkaturov.ru/files/file/49827038568.pdf In PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/75575520619.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5400616724.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/81731817134.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/kesoza.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/biwijifun.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb0a45e25---foxegepanugugujefinad.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/71520863531.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/raperazogunutimalikeza.pdfIn PDF document text
    • http://scsytech.com/upload/files/xijudowedijiwawadenekoxom.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161356766e10b5---puzadu.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/13869480044.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fcd26eda1---lenazebelokatanaranod.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/nagivumuwovopije.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sepojomubefokosodigomo.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/95558800732.pdfIn PDF document text
    • https://expomediainc.com/upload/file/jazekopudawezibule.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/givugiredaboloxamaja.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161395e90d5ccf---ruxurebuwaminexeno.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/jenujuferujemolojikuvifi.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/fujofarilobaderalunugi.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/61522514563.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5562100c6---13215199085.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nuxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dual+boot+windows+and+mac+hackintoshPDF 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_off0001105d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 10824 bytes
SHA-256: 6f6a8152c1cbc413d153e0d81da7584439681b8a8eb29b7925216a0cff73a3a5
font_01_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 17316 bytes
SHA-256: 31c436b117d4dcc422d705ec292420d48861ceab021539312f8a302f03ab8416
font_02_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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