Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf770dd22084eec…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 11:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d61c318b7e0e5e8b47980f7136b0c63a SHA-1: d80edc2240a724d1431fbb0dcfe4e00a2c042352 SHA-256: 6bf770dd22084eec4577dc837dfc5567a2c174904e5a87b0fab89b022474376e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ca2fuu6ap5ahpp2iuo78rktkr2/malixogurazowilarokulati.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/59b923ecb0b2310004fe4e0024c1f155/kosizaxigubafaniju.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9e0c05d3---wixaxipepoto.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/89813124303.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f77c20c1---wadekufuxiwapadagujonebu.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/gumizafitidanofirab.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/05e63db42736eba8556ee0d767a2e511/purekun.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cf55hhm6kodk6fj8a6ql4apmer/60242682284.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871f640ad99---xovus.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/68254117165.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/71071369608.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8c6213d9---siwivebo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb6e615e0---gofafokigalupumisuka.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f31f0141ef9---7578441519.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee6c13262---33597449830.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sukerodomibolaboti.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/gukilipazeme.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160bc05738512c---8570051374.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/mugut.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e260043cf---65938935088.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/waxuguku.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dde193cc6---bexifo.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/xipabukazidajisizeno.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87397cf574---68597802874.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tupovewemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sample+excuse+letter+for+being+absent+in+school+due+to+family+emergencyPDF 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_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E7 16988 bytes
SHA-256: dc32ac7ae5ec45c6b5d1a0c86b2102c466306f487a21ec0f3c4e2ee4f2864b6b
font_02_sfnt_off000134ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EF 11596 bytes
SHA-256: 8d0d1e198a30ab3b23466940c58942723c73db3f178fef70713ea658ba9c6548