Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c52a18fcfe0e45…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 05:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfe81f241ba7764158653805890b5e75 SHA-1: b59b7e8671e2df943323a8fb46b73c871778ecd2 SHA-256: a3c52a18fcfe0e45adb194685cfb36228994e105a8e175391cb066e03523396c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple links to disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/97967d938eb78b059a0df58089f2383b/22016867738.pdf In PDF document text
    • https://dadrarad.ro/userfiles/file/kadakufitipulebaliziv.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda58b042c05a1e18f704d6200787826/gotejaregexunagew.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xolaworu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6973c71131ff421c97cc3ebb497f3ab9/monewowaxiliku.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/sapadazutu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/4163776270.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/76649596849.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/34215500804.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vaduzigumavu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/90410937913.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa943fd10c5ee2d51a30fc71ef25a8b9/98328229494.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae30db2d10a---rozadisuvexuwaxiri.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/81995811965cfc328cc10f3516fbe555/72321876441.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ff242f1d---64422077413.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/11005066575.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/43836633016.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/84239591573.pdfIn PDF document text
    • http://wohntraumgmbh.at/wukudorapat.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8c7448be3b1b5573cfd3d47ed614fe18/90063705285.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88a636e41106631fa3051c8e730753a8/68050728866.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/dotonulixosaxukewug.pdfIn PDF document text
    • https://auto826.com/uploads/files/jinewubuxobugodexelod.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9d1a8d52---winuxugevafovawatulajode.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/roseboladidejedemokeleb.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc9529b31---67272152105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=advantages+of+using+the+metric+systemPDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 18128 bytes
SHA-256: ef86ef660839c7d393d1ec913850328da832ff7ddc639578fbe2fdd49d605c3c
font_01_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 11140 bytes
SHA-256: 87ad2b21cadfa71eed38c84a37e1dd3249ac1cd84b76d3c0de886f7cfe9416bb
font_02_sfnt_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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