Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37bc937089941b…

MALICIOUS

PDF

80.1 KB Created: 2021-08-27 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a37923ecf8ca19c3f847899990decb3 SHA-1: c11428583f23985c1eeec15af1807e4321026564 SHA-256: da37bc937089941be9072f233b843288c5e4de01249e432653d6c6e9d501f5ed
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of these links and the high confidence detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/99ca91d5459e90b5091f388243399c63/nugorug.pdf In PDF document text
    • https://digireg.si/upload/36334409672.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/42918461478.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/6914517900.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/83mjeqpsffhf0t6d69fuod0s9n/niwetezi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/eaeolv45hiqm58q8un9r4jfe0n/17619894082.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/12859789997.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/76733057241.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///rorabowiromojozezugela.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/34764440735.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bf189a2b72138045547f5183b6eaba0c/75492207731.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/43459413470.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fepimukafofilogikezujekew.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/gabeluvod.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/popixugokip.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/95392433659.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2b0edf0d0f68afd3a591cfb107bcbe9d/nijakizivitevadavufolim.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/31381941206.pdfIn PDF document text
    • https://suksesunited.com/contents//files/88055806475.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/memawejunorifidogabalad.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5b5e29066ec9d80a41322984f8b7e61f/56965163036.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/71070426005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=coffee+shops+indoor+seating+near+mePDF 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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 10928 bytes
SHA-256: a6221c9e79d661443eff257c9aa9f1ad53fce7af8cf56dd3ed1dcda5d70fca62
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 18608 bytes
SHA-256: 8a6ae57d6b85830d96a96b95d9741988b9213ef3667aec2a6a36e3b31611cb81
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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