Malicious PDF — malware analysis report

Static analysis result for SHA-256 826550593d7d0cbe…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 08:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cb7dc795b580cbb57d1bdad2230b04a SHA-1: 18b0bff64ce98ea7dd5e4219c5aef91b54ba1321 SHA-256: 826550593d7d0cbea10f406d5b5cda1dff3d4a4ee1551f1829e4d30a3f177a11
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially untrusted hosting supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://habitat3.eu/userfiles/files/vunejanasaboru.pdf In PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210810_000034.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/97957361182.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/14433981320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab70a2353e6---77196459779.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/39681721601.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca47f41b9---82651682526.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/10829013623.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/butekajununovilegenetum.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/jufipifobeviwo.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/nodezujujisi.pdfIn PDF document text
    • http://thedreams.cz/files/sofevakexekudaloxu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f4k6iphfe700bssi34bsdeks10/rajaxomisumufamusiwozur.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/vuperitizubitega.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4ka31eghaijssmm34ni6q9844u/wekepugukepapuv.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/lugetetukegojofonola.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/55805096324.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7f37dfd8---fenoz.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/7784315671.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fd9ab607---padaroxumuvon.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210709152011.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cad60177012---99438551035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rob+and+smith+operative+surgery+free+download+pdfPDF link annotation
    • 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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 17652 bytes
SHA-256: 7cf67dc2620486df1eef19b74cfa96868d5f7c8bd0f152a56e29feb6f6c3f25a
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 11496 bytes
SHA-256: 7d1b1caeac39bab4a812dd897907fa762d8e7270043bdc8b513a007fb476224d

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