Malicious PDF — malware analysis report

Static analysis result for SHA-256 e939f1fe0af0b9dc…

MALICIOUS

PDF

87.4 KB Created: 2021-07-29 21:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f8e8347641d21f5f86bd2c8e5c0520e SHA-1: de4dd15f4467e244c640284696f16a1a5a582ace SHA-256: e939f1fe0af0b9dc8465c83504994cc9e048bc857f37fa2cff270a8454ed9682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://egokituz.eus/files/galeria/files/lupetami.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/88556816245.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/xubibebozenavi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe8a34e4e2---sijejumanexuk.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/rirapo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/pafuzo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9f2699e1804b65e5deca0a3e2933064e/12187400094.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210501205957.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ad326b0f---vapajejowitarez.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/viwubajakofezewewomubumow.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/21005158551.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/91528925250.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/naropododas.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/pazogosud.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2aa0a248df172c6af1e40ed454c103dd/31276127431.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d1d4b83249a9ba021594ebb3e759cf3f/89024554898.pdfIn PDF document text
    • http://uamarkets.com/images/file/pufemodaku.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2c5pi4bukpk1f7pc7mec8gvp15/49413466578.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/wivemopefevizidigibek.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9lfqs648kc21p77ptt0u0vbo17/xewofewabepa.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/6805232413.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/36154868103.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819e26e0d47---dujatiponovexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+have+a+high+iq+babyPDF 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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 10512 bytes
SHA-256: bc3c20cf3a744bc09bfa944d4820c4ea1ac623fda2cc11def0683d5eaa543206
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 17928 bytes
SHA-256: 39dfb7f86593a3844e837f97c005c9b21bc16cf8a64a6c967b411fc801875d92

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