Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33013c99b935215…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 21:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 63e1eb2b8194d3d384ede105452c90ad SHA-1: 40b730fc10fa6c9ca9288e820078e6106334a5d2 SHA-256: b33013c99b935215325cde1c72f5a799a35a2b4bec2a174f12b513dfb3a50064
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content hosted on these sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://synerhu.ru/uplcv?utm_term=the+girl+in+their+summer+dresses PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be86c418b70---51494898279.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9c12d1f36262b2d3fe8461bb00bb0c5a/78927118256.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160988754cd07c---59107329063.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4023b432---70177412856.pdfIn PDF document text
    • https://campermagazine.tv/public/file/kajojatam.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087434ecf099---fufajosesagedexeru.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4398b00742---sutagorolu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1bb94b40c8fdec50a5a16fb9a412e25c/zodawi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd171fc32---43796134149.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/fe3qngh6cqv4tisruejpc3u26q/wedajekadujiketek.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b12ac0d52---ginedudametina.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/16230360783.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f34371994---26359887902.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/27cc28bfea18d2f70726457c5c524ba2/73531513830.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098d00c62592---71236326360.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c383c1a37a2b5eb6412fd7fe1fec1485/78198441919.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971d100fa00---midolujivokubalukur.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e94b87c---99976207363.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/36c200f30658bbef2fbdd565da7b4fe5/51302039611.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gbl2m9gvtql9u8kcsnia2e5jtc/tolodij.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/mepufiwamepunolegiw.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/edf5de178a90b9d3f7d8ae86733ced58/suzukuzibugoromugunufuroz.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/osjpdtnrbbg749qg6d8170od9r/fonujas.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7jgqsrq20p45c1qstleguccita/64229571236.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 10476 bytes
SHA-256: fd21fcc234fe6eb8d60b651fd5f9f65e6af3a28c3e6c97c4715fc1ccbe636954
font_02_sfnt_off00011d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 17436 bytes
SHA-256: 07b00e85268151f0982596d4e745941cd5f8c609ae5d9de96c64e669da4e1bb1

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