Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83de6f1398a1892…

MALICIOUS

PDF

106.1 KB Created: 2021-06-26 17:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 7b86a9637161ce138fe50a578c42f96b SHA-1: 678897373aa2b678768711564e0c6d2b682752fd SHA-256: c83de6f1398a18925148ea2ca0d46d2cc0db59ab57dc97e568205b3842ca5875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress installations and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host and redirect to further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d94f9a1a5---pademuzeropevugiluxu.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1bb9196d---34887746359.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jukenemat.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/posewotavenetu.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/45408895852.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/44497144273.pdfIn PDF document text
    • https://schmitz.cz/res/file/xakavakebula.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cf7b654c---39153895057.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/24ef0815447de9e48a551ff4f1201c7b/87949754326.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65930481d---63954167699.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/rawinigipulawaduzigerosez.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4732545819---tabag.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078778f61abe---10232782471.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7c6e8092caab7fe906a97ee293f0eefa/tipoxozujonidoxibirifosa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/30b37ca8a405a02c1ba53e9050679138/74562122619.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b826aec24fa---kawenakisalezezepavif.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/sirakabasevakozafitavij.pdfIn PDF document text
    • http://dalaichau.com/files/jemevazelilober.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/me2lemdje607f0p8escdli60fe/sipivaxikivevomad.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455ff7298b---37064909606.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1fbdeaa4---36533871647.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd06d2040---mobixafunelotinaw.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/rawisajaxamudu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7ecc4196---9627659514.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/jebixibikodonokir.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/mosedorutusejiweronod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=an+ode+to+himselfPDF link annotation
    • 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_off00013e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15648 10340 bytes
SHA-256: e62837d6e439fe12cb93ed025beceae6bcb1560649492a27345681a420324bc8
font_02_sfnt_off00016d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D62 17564 bytes
SHA-256: f23062561a370b7bf7ec53c272d20517c7ec19cc0c380b96a055c1cec0bd36c2