Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4256d43ba580632…

MALICIOUS

PDF

89.3 KB Created: 2021-06-28 16:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b43f673727ee7372139fe5f4d52c821d SHA-1: f0bc2d347b7439ff12c8874b4cae5f34450118ae SHA-256: c4256d43ba58063277d11cf4cef2354af479cbfafe39cc3e386fc881148e1ecf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, functioning as a link farm. The 'SE_URGENCY_LURE' heuristic suggests the document may contain deceptive text to prompt user interaction, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=watery+eyes+4+month+old+baby PDF link annotation
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9eff174a64b67a0b3b75e9d145d44cfe/96937738633.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/6c2a2qk7eau7bh6oq5h5l2uka7/xotamidebitibob.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35630758113.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2c5dadf1---pijuz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/47577419776.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/7188185319.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/77782368093.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6n1k6pa36aalfdq0i8coqrsd5/zozuzadekotegogazapolobix.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vixoberof.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6b11c24---99879900115.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/65020057059.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb453809f7e---42657432280.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/j05vlp91g1su8s5r0lirvrmhmh/54986596879.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecdd66631---67998183208.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/aa689a4faae8bff0b1dcfed26c085373/lomime.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dccee144---28844730380.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/eit0v4879r6gj0kkctjbb323so/17254454650.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3365f36ce356292f92786d019e479359/maxipikubelok.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/77r9en21ng5hltg7bfc860mbvv/wejazarijowipovagolote.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/duber.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160970c2271a90---konajusowive.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9c2cef309ef73a8c14ce5453d24a0d31/puzonuzubularofabofi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2679564913.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/kavubikivulutaropo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b19e1051f85---82334901707.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/344523ccbc1e55c61b382d4ec8f14706/sifepudumoruwo.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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10744 bytes
SHA-256: 1c7bf321ade0b86ca588b23b3cc4f23bc50b4ae527093e17b27c1084832def32
font_02_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 16392 bytes
SHA-256: 57203da2b7b943bbbc6623288912e7aa1b0e2abbfd19ceae8b399b5eef412031

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