Malicious PDF — malware analysis report

Static analysis result for SHA-256 6788af4de8e5396b…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 03:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 17af79f905a7bf5f65040009b3d813f0 SHA-1: 0fa5ce2ade09d9b75c31036c67f210d7f2ce8a6a SHA-256: 6788af4de8e5396b29c903f9b8d9411d0b727a7682e20bf6915b3a184f53180c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=toeic+reading+sample+test+with+answers+pdf PDF link annotation
    • http://fitsiluet.cz/data/file/74213112239.pdfIn PDF document text
    • http://jar-ted.pl/file/90244096534.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90135b9609---salijegek.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80218670448.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/88346164413.pdfIn PDF document text
    • http://yuha.be/_files/file/xekamubaw.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/5da10f95ec11a23876e4e33d82fa66f0/livegan.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/nupopobuxu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77c575a9d---jigonif.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/rijiwigoku.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd530560f---gezokusebaro.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fho8p79mhd0u8ndpuvt4460103/28262311171.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/antcqiftfin69mg2vp2n2aufn9/bemupedabisanitu.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/32279092343.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/47502951249.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3350c10687---baguni.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xadimuxejiko.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/f4b36e31ec9d1ae09d48d6cb05e51ad7/tazokedivufavivozep.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/jaboz.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/hg82005ep8qom95ugg367jgjsr/bexozuxanesekikurijufopi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34505ebb6---ninezaw.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/fegibepozipudetakazo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f116da191872c4b63f852a9a53048cee/89563772321.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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 28024 bytes
SHA-256: 9a13227b3a9e001b97829ce443a98876fb36d0956bc8cb59f66c343e980887f9
font_01_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 11116 bytes
SHA-256: b244f71b50fde9b85869f7f2459d9e0c0757b654f4d3d56ed84aad4e192a69ac
font_02_sfnt_off000138b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1