Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d5f508c182e0e3…

MALICIOUS

PDF

94.8 KB Created: 2021-06-27 11:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ea1d1abdf5efb7fe895d0d96837e53fa SHA-1: 8f4df4c7f4c8f79b75acba430a9e7d6ddae3fa4d SHA-256: 21d5f508c182e0e3a27045a767ea624a65ef8f1c0a02f15c17c8732045ba8f46
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, specifically within the 'super-forms' plugin's upload directory, suggesting a link farm or phishing lure. The presence of these links, combined with the PDF structure, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/60bf006391dd37ba5b825080f8c651cd/rakerapovejalesoj.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/33ed92f1593bd9a1025222a19b31debf/ruresugoj.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/77516850801.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b566a182eaad7028a6561d7c20a231cf/53795294974.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xugamogatesud.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/witugusolujufugu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c7d45bcb122ae2b4853048a69a85fc81/jidozidatimufem.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/72r38k2sre5kgidh5ijclel9la/pegilavopegivilig.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/bulepapebulekokewutavor.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/81689006550.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/81986547255.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/85b19c220657c2cc56f247fde3495467/54255461419.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/67817964788.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/42594990716.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/taruperawexabu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9d4cc62d22db0ee8077ad2ba3c4c5178/vupetagovutukopon.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kghgl6fhlq077ttn3j20gpjagu/50078655453.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/973nv132fasr9dvrfdsa1svvpl/razopekunitoteduz.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b58dce9d0fabe258e41129c84296f355/tenif.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wizatikawabiwagazojutoge.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bc57a1b70af08f16a48acd8370ebb1f/linunukelunorabox.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f021b9930a---89022655982.pdfIn PDF document text
    • http://soles2walk.cz/data/file/76426531892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=budget+interview+questions+and+answers+pdfPDF 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_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 11076 bytes
SHA-256: 83151421d6d1ba47bcf74522092b5566057553197fcc5490ad16d314ca2f09b6
font_01_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 17932 bytes
SHA-256: 85e4fc29b70447aa50b2908480d51a07461b8733de555d0b45b10fd5b7722383
font_02_sfnt_off000155a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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