Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e7e893f428e35…

MALICIOUS

PDF

95.6 KB Created: 2021-06-30 08:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 27cfafcae6fde771183ae25ef77659f3 SHA-1: fb2236defa8542e7fe496e6c03d0e46449b8e854 SHA-256: f52e7e893f428e352862ec9aa0c9a63a20a058a0a2c0b4bbef36ea9754ce26f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to obscure the ultimate destination or to distribute further malicious content. ClamAV and ML classifiers confirm the malicious nature of the PDF, indicating it is likely used for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b597dda2f---dizudafeba.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb618497d8---73101376127.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/14336131361.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f37154b7---susitubog.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecc2ef545d434ebf4215ee0785dcb0a3/28246294942.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f47683378a5f8df20145bb7703b6c37a/22937688274.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fc563bc38d1b645a967ecfd3c433a47/13096512357.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ce9a5313fe88297553908d0bb8733124/69608548317.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b955c38737---4030901228.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4c4a497c6c875c7acf6d7fb99062d1ce/biresen.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64cc645ab8---19752738087.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/t1vrkh3lu445cmuhissd73qo0m/vepamejatikaput.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6b964f0dd22f27b1dbf4049f8b5f3e12/jufaxudogepi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/o3de286fol4cil46jipan8k7ej/26498245281.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/dagemabikadiwenenidew.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbe1c0712a---38148807889.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/536881025.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3c5b9307---zimapojixubojogofuro.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/6156683597.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cf8j1k8a8ii4nggq1qi5hetn49/16929840782.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/42748253477.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/firutixijesigivofe.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160db2790142aa---14645366237.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12111264b---bojewofufavo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd50e35763---26223676277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=inculcate+meaning+in+marathiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 10440 bytes
SHA-256: a70335b3f5edd12a494fe8e232973bb7d6bf185bb2cf75087568e836f56c9ea7
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 3072 bytes
SHA-256: af1a0b5c1044cae48556772832c6b8cb5ecf953b48d11218c3a6a3c0c1c346f3
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16472 bytes
SHA-256: 30d43a4cfd170a42df3db58264c00e4b6018d148a28dbefbe40b610c2845b526
font_03_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 20372 bytes
SHA-256: ceddf226d5ebe3e1a7f30033fc432a142ccbd3d2534ce0eb2edeaed6c3fc6717
font_04_sfnt_off00015690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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