Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74b81265abd1e89…

MALICIOUS

PDF

72.5 KB Created: 2021-06-28 11:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ed7793849a02a766639e4d697f55a7f SHA-1: 2f2714619a76c06b02e6948f426f785853d2cb60 SHA-256: b74b81265abd1e892dc171e270d8496ed29f4c3977d5215bafd181f667b91b72
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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://ketchas.ru/uplcv?utm_term=a+parallel+plate+capacitor+is+made+of+two+dielectric+blocks+in+series
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6a8032f8d8ff832a2420fddc50fa7c67/75988616837.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/adb296ebf87d479171470178d1d9d012/21744771605.pdf
    • http://agrobud.net/uploaded/file/sugenoxerek.pdf
    • http://dinskayarealty.ru/media/file/zadobarabewivarodikub.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bba3f2b---mazuvido.pdf
    • http://sieuthivatlieuhoanthien.com/upload/files/miwamogagufojiwovod.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c388b3d2735---puwugepuvotenejomakuvej.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c25f42ef2faae53c5764d15fa21dcfa3/77189851897.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/nanexanuzodujalateloba.pdf
    • http://keramann.ru/uploads/files/54733505442.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8162929cf4---tiriza.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57364abc0a---18804649337.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fbbfc50cffe4cd207694a599b846009/tokupenugagajuxam.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/domazabemudoxipaxupusevum.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b091ef15121---damuletikarudepoduvidi.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2ddf3298---nefonasulivik.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/pofulaxu.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd894bfeb---xukakesijar.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8sb5r4rg194v108gpe7jsm47h7/funedojesoponisanetibu.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/62266544152.pdf
    • http://norilskgu.ru/userfiles/file/domopamafamofega.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9a9e19ba---pubomuzotitalilot.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/992da1419b2cca1fe867e91b634ed384/8680023074.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_off0000b92e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 16792 bytes
font_01_sfnt_off0000d145.bin
57191deb4dea47aa8f7028514f09c2e3110acd6e4c191561cbf1040890f72623
pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 11080 bytes
font_02_sfnt_off0000eaf4.bin
0131ff78da7f8607ad4ce467763b7f4c40269fd36ccbcf7a1091e0ae05f9e3f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 15264 bytes