Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0251b7bd1a1dbbc…

MALICIOUS

PDF

81.0 KB Created: 2021-07-01 17:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d7b524d39024aefcd804bc7373ba57aa SHA-1: f157f368b568177ad75bfd5a02344a3ef0d11b7e SHA-256: f0251b7bd1a1dbbc2bdec19a1fa29e65eb9012edb1419aaf590c7c34d6cfd574
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt. No scripts were extracted, but the overall structure and URL targets are indicative of a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=currency+pln+to+usd PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace450ffd0---furimuxaxef.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/47110594168.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/11098968432.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc433a4f7f---20726527978.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246908e9b4---82759642711.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/11489897346.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/035adaf7de0858744ed1a63751297dbd/67681108751.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52e0a37b1a---xugibuduwadudamaze.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb034f6eb---61168005257.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/febixidikazixaguxa.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/18855a17a1f8560b4911566645723b35/tefapubitowonizujo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b599151c388---55603402055.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210607_5B68F79EDCB17E4E.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a062592e25e---pubipilokitukulinawibuza.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/nozatewowuderatipuwadujex.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/kurulisuwawarenuwipu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0dc1f261bc1359129c79fed552f191fb/kusufiw.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/4215mr3rrvcgrhvdrin2epd5o1/gumejonibexiw.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/acael798054g9q3kb3fe7047l0/negoxorajusivinewif.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608659db1a50b---85895345841.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/tijapi.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/91992031193.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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10496 bytes
SHA-256: 866c575ec366035684e74c338f950e9bf114ed24ba31e7b141efe896975d8e60
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 17476 bytes
SHA-256: a1a3f34c3ea95a3f2f5e4784aeaef3a365540f3aeeb20ad152cfc8f8e70cefda

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