Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7806abb44d7f280…

MALICIOUS

PDF

78.9 KB Created: 2021-07-02 02:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55801027ce0556769155a6c4bc6b00af SHA-1: 2fc94642e8880025160ad517f41a29dc7e13d965 SHA-256: c7806abb44d7f2805f9733d1f690cf4af8adea051de712f3a5a40d619e0b2ad5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7401d12469---19241072448.pdf
    • https://tomas-music.com/contents//files/63922970690.pdf
    • http://inventory-acepipe.com/images/uploads/files/pijadun.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/pisejidobosezozekejovedi.pdf
    • http://daindnc.com/fckeditor/userfiles/file/2907280295.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/26cp86k4hri61ndq6vfgtdisf7/14344363628.pdf
    • http://atek-ent.com/upload/file/79696852094.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ad97ce1a6eff83aa45a94622c41ac58f/tegulanosam.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210607072604.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/edh44janatvgk790im9h4s9s90/38734026700.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/378e834476b0c3f633e9e9d02bdc58d8/jerigonajepisuvogewubivow.pdf
    • http://jnafarms.com/clients/864068/File/maxifijujer.pdf
    • http://zoltysnieg.pl/pliki_wyswig/files/laxonepisejotejes.pdf
    • http://bettaletroom.com/file_media/file_image/file/18306740598.pdf
    • http://shuimotongyuan.com/userfiles/file/73460894808.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9fa81752---869179224.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f64fb7703---36923450288.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2aab6d577---xeduti.pdf
    • https://rajaunited.com/contents//files/27146500169.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/df7ce809f4d05d54566afa1d9468c633/75578708517.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=textbook+and+color+atlas+of+traumatic+injuries+to+the+teeth+pdf
    • 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_off0000cb92.bin
2ca84932b6143307b4ffec21301610bb1405174a6b56013a7ff9abbbe8f59935
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 11412 bytes
font_01_sfnt_off0000e612.bin
b7c250e8e9a8c50ff5325a95540bdf506f417894b44e432ded18f2ae51ef42ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 18072 bytes
font_02_sfnt_off0001143c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 16792 bytes