Malicious PDF — malware analysis report

Static analysis result for SHA-256 44539f433f2a2379…

MALICIOUS

PDF

94.7 KB Created: 2021-09-06 03:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 96e0911e0ab1d6ae3fc65fce06ec543d SHA-1: 2e02953cb37bbcf8aacd5a3deabfff5559976c63 SHA-256: 44539f433f2a2379cb17cbf793be8a3e975f84b03659e49727aa58bd48107ea9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=jurnal+asidimetri+dan+alkalimetri+pdf PDF link annotation
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cde64c5888282e31454e53ff10ca562b/51170342773.pdfIn PDF document text
    • https://rais.bg/uploads/file/xibodotexi.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/fajituzavuwaketed.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d64b244bc---rigonoka.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/24093925022.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bezusexasufamujomisil.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108241336151694.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8f567d18---fatejizesimuva.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202108152244331189.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/ledagajajeduzogezox.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/nokilaxobag.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210614073756.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/10486695707.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2135bd9faba74f86f142efafb20e5349/vipofaguvijamavenog.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/kekubewetufimukodowelezo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b94b835b01508e553802c98075ecd552/xepofigifozefos.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/raginodixi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af3579d0a---sufumogusefavozabiwufipim.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/79985849594.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/49716133432.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6o9sfkb532va4u6d6hgrlovqo3/moxefawewasajexawuxano.pdfIn PDF document text
    • http://webursitet.org/Files/file/dexitodejedixidupiferefog.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/7472833854.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_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 10720 bytes
SHA-256: a2d811061427ec0cc85a91438ff4d39236dc5afe5c354715da5bdf18d0cd85b9
font_02_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 18496 bytes
SHA-256: a0eef94340793a4929e2fa9c1efb93520fd6c8f496900331d3d21024a9db62f0

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