Malicious PDF — malware analysis report

Static analysis result for SHA-256 91492ff5c3d89b77…

MALICIOUS

PDF

92.6 KB Created: 2021-06-30 07:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fab0c9347a3d4eb21da1c3c11857d44a SHA-1: 1f0ba50da3a36467bc30d88ff5a774f15993335a SHA-256: 91492ff5c3d89b77c274256aff08cb4d4f9b6a22433e72118081687254a1a977
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q8hptgrbjg0beek7aegdvc1sir/43547045344.pdf
    • http://buergerforum-tirol.at/file/58043773596.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4731ab92---83195940637.pdf
    • http://amphorabeautyclub.com/campannas/file/35319528035.pdf
    • http://blow-w124.com/js/upload/files/17172096590.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vvb72vkva3n709nhtk9407esl7/porotagabi.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2eb5a66aff66b5f1e5fd1594fd7b2be4/61921946143.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fcoeol2h3itjju6uqvq65fq8iv/sejinetokalasobetoja.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090993f7f65d---3310383763.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/21991856004.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/xesewadukorarejanavewo.pdf
    • http://www.aqsclimited.com/EditorImages/file/24047475744.pdf
    • http://eiak.org/upload/editor/files/bijinavub.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d73c6fe0dd4bb0a340b61eaad23c8dd6/belutorajojofojexiwaf.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2295638f7b0b42d14be583590000585/78911882559.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/iro78mpnm9adst1mih699pn0sq/pevufujekubuje.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa964c29c8d---54389727841.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22562b5b90---82887246204.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5b0e924d4f5596e196787da33b2b5966/21952041397.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c47883b670f5fa7035867900a2ca77ad/35732866481.pdf
    • http://musorcentrum.hu/files/article/file/72107090068.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/baf4353cd15eab4db6b390a5ccb06175/perinujavugewib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=solid+state+physics+neil+ashcroft+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_off0001058d.bin
e8d41a68c1d03bb5237008d8fc35d64391019db252207bddb3aba9740c49208e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 17780 bytes
font_01_sfnt_off000133a5.bin
f381db5ba6d258e4e667c50801b4c0b9f322f5c09e1e8a226c2f4721e4f40683
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A5 10908 bytes
font_02_sfnt_off00014cd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 16792 bytes