Malicious PDF — malware analysis report

Static analysis result for SHA-256 37862faa4d23c133…

MALICIOUS

PDF

99.6 KB Created: 2021-07-13 23:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 0c14b91af637209a915ba064d8320d55 SHA-1: da42171f86d94844c02d15a39cee56c97c848f1d SHA-256: 37862faa4d23c13342ba448411840189c23c3842177a828f7195a19ebd4e9ab6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised WordPress upload directories and other unknown domains. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4914d57473---winomanuripasubatu.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe785c73---lukisinopinadowo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/venemanelek.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/493p83sknt45lvgh3ru6ahb5r5/49021205264.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc453c269---24425568677.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6406ddc621---93291028828.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084a48ecf4---xemezevud.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210606030024.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fokftkfutva0vmcrqtcimgaff5/sepuzibosafalanu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/38416218735.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mujiseseweponakufani.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lusovulubapexekeloluduma.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac72c152d41---mivakupipajejadi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/psuvik78qmkv14m2m9vbumn8hc/94166798601.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/32164583341.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df26b7609ee---lirefonejeribatap.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xaferigatina.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/88131133735.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/jifodefev.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607461bd439fe---dipafetu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pstsmpvjqc0uqbdsppfgm453b5/xipuz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5daddb1d73---48669476319.pdfIn PDF document text
    • http://poiskvod.ru/images/file/83841154228.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/botubivum.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609acade47915---xezok.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f58cad6d---9824692812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=medicine+for+cyanosisPDF 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_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 10432 bytes
SHA-256: ae467f6f340acf0d00bc7ff8c9c5a150a1870eb07eb3ac435b6b3ee8d960d724
font_01_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 18068 bytes
SHA-256: ccf69687dc6d33e547e6783cb0d16997b95eb0b10f4653b86cbf33c14299dcc4
font_02_sfnt_off00016904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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