Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b050984ae6547…

MALICIOUS

PDF

74.6 KB Created: 2021-06-29 21:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b422865bb773eadcaa83b9021b4db008 SHA-1: 0dbb4ee13d8fe3c58418eb76c621c777f0f519d1 SHA-256: 1d1b050984ae6547114838c255d53e9b416ad0a05bf3d12e0dc73a7e9e75c28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=another+name+for+spongy+bone+is PDF link annotation
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/wituz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081232ebaa38---22034835003.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/3fe40b719c61e991d42a8005a99494b1/60158211334.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210616_EF35CE9BBE236D09.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd35d991c2---witovodijixobopef.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/jf0khr5bo3g5tp351smumnfmnk/ximubalufatunurudisaba.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/19127813789.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/meron.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zifawitawexitepu.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zadogukevezeka.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-29/20210529081217987396.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789cf47c794---loranebupik.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/49359664046.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/mimonepalalulutase.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/tudalixato.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ad64a3475---64209107992.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/784e81073e2cd725cdc308dc253427b8/katakeputedolesaded.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/32806690880.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/roxojijidujowinuwowi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc476419d---doravokeduludomowojoj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/08edefe7bdc81b53c3551b66f423c4f3/lubuxugowunul.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8da98435---408920195.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607293445eba0---ripezugalomopane.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wadewapemekere.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/zikosikibumufotejog.pdfIn PDF document text
    • https://medlineplus.gov/bonemarrowdiseases.htmlIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 10996 bytes
SHA-256: ca5a2b17bcb8d515122c1719727a5a6bb390e4c7dea7120f84209aa1a031965b
font_01_sfnt_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 15888 bytes
SHA-256: b43b5498a775ada79f5adde0155ccebc9d29a1640121d3e4a6147719f783eb6d
font_02_sfnt_off0001050b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1