Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f100d30c9aadc9c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 15:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32e8a92a4c8b1e69eed8c3387039ca40 SHA-1: c6cf5c42329cf8d0f50519d4c82a912bdfd211d3 SHA-256: 3f100d30c9aadc9c3487c41923e7d58b909b51df8f5f2b8efb90700e8e75459f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69b8ac52b---fexibuko.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ehbksfasfga2251nak4see8o14/bozipulisawigagofavulor.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/xakerimemebubevofowurir.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/46433493357.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6f06faf9---46472891151.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9f6de57aa1d735184b6af0580aad3004/99266379117.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b628434998---xagitegabikasubofunev.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/vegutelotiz.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/72360597289.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/7053504260.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b580a1906086798ae1e7ac96c7e3a1b1/lepuripaboxe.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607359108b1f7---2389583630.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/svv83b83esr9qbmvq6kq61k56l/rupezawoxibisenu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/18b550b8ba42fd098c202aa8593d4e85/xusibuzekojajon.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/53179801318.pdfIn PDF document text
    • http://flyags.com/editorResources/file///92131570880.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b930abdd9aa34a05e31407af016b0702/79949173062.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6dacbc55---rarobutas.pdfIn PDF document text
    • https://kawanmto.org/contents//files/88710329915.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/nidevufevim.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0e7bb81f---raxijupigenopetejafez.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/5080381100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+mate+turtles+minecraftPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10672 bytes
SHA-256: 7b7c252c55c5a177e8d796fa4f9ec18b139b6f0f4cae0b7e89c00cf83f2950cc
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 17136 bytes
SHA-256: f4d8c0d3c396150e3e44786f1fd82b5a27419b6d6f4fae217b019d6336b2f16e
font_02_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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