Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3b9f420aadcd69…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 06:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45f6d88983030668727dd08ba423d628 SHA-1: 25ffa8edf193f489a3721f93e93bb4ca3279b030 SHA-256: db3b9f420aadcd69e0a279b3293d01cb2e51b6dde5082b4b80a8e72a1b90cb4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=miss+rumphius+pdf+free PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613554dc850ea---fafujewedewiwupo.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/14431182472.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/46608797011.pdfIn PDF document text
    • http://nemochem.cn/upload/files/tizuduxofo.pdfIn PDF document text
    • https://kaparatt.com/images/File/51030195214.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210920113611.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/narowewuwoguzuredizute.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/korewojetoxabifibejovob.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65589688129.pdfIn PDF document text
    • https://ikansambel.com/contents/files/34968007048.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/lisopun.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/37516313974.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/38842925036.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8458c443df40c4b6d7d0992bbb08222f/pazoloxolukozibiz.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/raxiw.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/87203558594.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/94841619136.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/69591008aa132c4e0280a73b00795efb/92984388357.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/18962803330.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gewetapugakalobese.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/tijovijezifopomafebusu.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/3904770988.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/gadusodulikulegeb.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_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 17644 bytes
SHA-256: e1c6088e1a7eb1c6962d5aef0ab8e1dd1ae91a8f247c38983774a339415933cc
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10324 bytes
SHA-256: 808f662bfac7b8be35d5a0da7c07a7af966fee0f223a0f0580710877e1f19457
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1