Malicious PDF — malware analysis report

Static analysis result for SHA-256 742ca1aa25ad45f2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 18:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba9207364a1866961e8c8a83dd648994 SHA-1: 1bb39ab64220a3367c22d092295773778aa9676e SHA-256: 742ca1aa25ad45f20fd24d40ba7df58f36b9281086fabf148e3d7b6e9fcae108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous embedded URLs indicates a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f786a966---46342077947.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437c657688---lebuwuzubavasiravosesi.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/zelazo.pdfIn PDF document text
    • http://hidropro.hu/upload/96168404266.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/japofawumoduxisesiviraj.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/ratifimomekekoxafobo.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/64069538500.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/kotosawodenidilogiz.pdfIn PDF document text
    • http://kco.su/userfiles/file/majabegefiribabugetumu.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/notop.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/46658030959.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184c07cf8c---14486731123.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/nitokupajenalutudus.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630787323_1.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/bakafowodema.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/97921679164.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l50i7thodpa6171fbcglcnei12/59028423788.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/57303423788.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cdck851bvpvrrsod82g5anrvkp/24650005391.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/koxewusudaw.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b0dfe11c463a2847aaed39f0a138d8fe/voxolebavarezijewusabi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/17399411588.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913234744.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/70730613769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=safe+mode+phone+turn+offPDF 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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 17008 bytes
SHA-256: 4ad6516c7e8fa52c970dd2bce5488d3b5c61a25e649f6d314ebe6713e1d6ee18
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10632 bytes
SHA-256: aa05dbed27f576f4ee08429b19c10adeabf3c5a7bbd5f22049217d45eb05e2d6
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1