Malicious PDF — malware analysis report

Static analysis result for SHA-256 2820d53ba15f0762…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 23:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e0c64f2df76141e2187838638fd4c497 SHA-1: cd7b9836479589633ec93d5eb93dcc402b4de5bc SHA-256: 2820d53ba15f0762ea4d467cda01a399404f29137166665bb072724619f78916
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or spamming campaign aimed at luring users with deceptive content like 'free robux codes'. The file's structure and the nature of the linked URLs indicate a likely attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=free+robux+codes+2021+may PDF link annotation
    • http://hoteldanang.com/uploads/images/files/fagejutofi.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/79977894823.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad73adf32e---89987712379.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/sidokufikegekebu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1447a1fdb828355f9f1b736e75940c1e/52450620183.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138040680eca---deferaleti.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/sirasetetu.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/45899413496.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/tikaragokokisivis.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kefowulonitosikama.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133260abcaab---58806988926.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/36969882016.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219111650492398.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/fixivipalufajut.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/bivusepidiberimo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139dab7d7cde---gofala.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/nitominidokativ.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1d11005---resanofipaxakodijom.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161409ac3c9703---67736688093.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/saligefanadibodiki.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/juravimuwapotufudikeka.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/niruvur.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/52214653908.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/74551917944.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/nomuwajixiginun.pdfIn 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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 18408 bytes
SHA-256: f7706c5dd4c1b9b6c4d1168751473004a84b0247064379d7c9fc12ad35ecb06a
font_01_sfnt_off00010e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10920 bytes
SHA-256: 4490e6bf57026523827aae496de91fd03ac562aa543c475a4863dbf4c085dadb

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