Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54ce27926601a3c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 00:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 550918ea8640aac3b295d3670783de20 SHA-1: 5c860eadc00bb805a6656426136c5c83ec701e2d SHA-256: d54ce27926601a3c23f950eb52ca6a0e6ea6713cf0afe3a83de8d702636218ce
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or disposable domains, suggesting it functions as a link farm to lure users to malicious content. The presence of these links and the overall structure indicate an attempt to deliver a malicious payload or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sva-jeanroze.com/xmedia/file/sakasiwuv.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc046e22a---56114761161.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/fewabelo.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f52dc493---62562043384.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/72452100638.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5c284f10efd468b4ffa043aa5e1771d8/bunusuzajekexav.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210701223126.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/nifuwetifukaxemipepon.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/00681ec6e4c44ffca31673b565b06c76/foruzunetanin.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f5b5f25836c15f131620585b64db389f/senaxusiremubuketavovat.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/fifavexosimeguzanosu.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/1f0bnfj978ip38me2a16lrafb1/69439376958.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/14757250715.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/42897553524.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5485f511---69815040583.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4hheunpc3s9pugqhu9i80uj126/mugawo.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/bufomutix.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/55020614580.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/a1fd58557c88a75c8d203fc1fdcdc249/28122561322.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f7e5a1c10---20684406808.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609951dd92916---ludobunofejagesos.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/gebabugorosavakizawaji.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/48168503945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bible+trivia+questions+and+answers+kjv+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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 17972 bytes
SHA-256: 034ab341d154dd84e989192ff0a8c4d6b47452020c9d9a3af479534b6b37169d
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 11304 bytes
SHA-256: 5645256965081fddbebb329f5afebd6822df437e7f6149cd6d6a76679ec8a69b

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