Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c62ad287d18c7bf…

MALICIOUS

PDF

92.0 KB Created: 2021-07-02 04:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 231b469a1b67e9e8a2e629930dd2db92 SHA-1: 7bce81bd6441fe28eec65540e61b50f95d771e03 SHA-256: 7c62ad287d18c7bfb5133bdda9560d1c428447993dab29aa5839f89db2cc9f46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.tobywells.org/media/fckdir/file/41700103467.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97fc7905b---gifezujedezop.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3217fe21---25644854315.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/84vrg4ed35m9lgg9ck5ip69v55/7114132756.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d16612a04---mimurigakavupubojex.pdf
    • https://butchercurnow.com/img/shop//contents/lefofudakajo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d00c661f---giremusesukegakibuxa.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/291199657f492867156920583b349146/ferajepekomimuwuwe.pdf
    • http://esejsc.com/upload/files/30922043000.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa19a53cec---jopakizulojuvulamava.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160965fb60a774---10265393494.pdf
    • http://lifecare4all.com/upload/files/laduwatitedaxavamolub.pdf
    • https://dotcomtravelegypt.com/userfiles/files/funixaromujexogub.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c11d5c439---sutorulozegawurepusavonig.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e7c9e29aa37035b57dc50b570202ff49/87567735758.pdf
    • https://aduanaldelvalle.com/userfiles/file/66050704004.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c80b5f9e---74700129414.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c782033a6---69064830007.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab98780045---75247900413.pdf
    • http://cn-daomeng.com/upload/userfiles/files/2213ddd6b2526122feb14cd6fb65f78d.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078605f9488f---ranofurilu.pdf
    • https://paron-rebondir.com/uploads/files/pusojurizob.pdf
    • http://dyglas.com/userData/board/file/rexawefuje.pdf
    • http://animalscipublisher.com/files/upfiles/file/87052128131.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e950999ca1---80475414086.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/67183674309.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jesus+turns+water+into+wine+for+kids
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16792 bytes
font_01_sfnt_off00011b28.bin
3d3bf91227b2292811d0b9a9555d22eff5220c3e45d1455ca0fbf86a96b4d8ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 10572 bytes
font_02_sfnt_off00013382.bin
4592e6af8fbebef283d15001e4f07209a37f614709c31cadd72e1250bdae4d89
pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 17492 bytes