Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0af26e19bc4acc9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 19:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d26de986358a8dd4342e6dd9a72a26c6 SHA-1: bcf600ea069a63e50d3cd485a777799492575008 SHA-256: b0af26e19bc4acc9e0daa137e6163fd10dc0d89a2c63f7e3ef144579940dcabb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://paidionresearch.com/userfiles/files/57381690819.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3f017f18f---duzupisiv.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1b908e7cd---gujimorosasamurapin.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fitijafenigifukawujudukat.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxukob.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d61b0358cd1666adcc37647124b2a39d/50758202115.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/81377279507.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/kekofo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3dd0f30ef8d9cbb3cd7482eb0b934e42/74240306626.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/64436498395.pdfIn PDF document text
    • http://spharma.ua/files/file/29218218358.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210804_7D7C3F4B901AEE9B.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8b62f48317fa4aa3e77251df22cda989/16122257717.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca7f014225---70316453126.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/78429686434.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a62795644907c49cab8fb1e3d043d74d/78644781062.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/25671222046.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dlnr1hpd898dutb45nfrl3tbq4/dafijafemunutizixuf.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/84537095040.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83c297298---kusarutot.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b467b6ed9e1---64644463273.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/509lu4461k70o99534vcs1p1h5/99077983216.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/sadilanolajidiwiduja.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/zezilekejef.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/87561276142.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/desamudanunudedipavepef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mandolin+exercises+for+dummies+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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 19028 bytes
SHA-256: 5108363aedc7b2e6ba85dca19653ac0b9854e9a5d2bee3f2bffb02bef547fc9f
font_01_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 10880 bytes
SHA-256: 39d6ae1a40739df1918d5d500f21b0a841c45bb5c2ae4b391a3dfecc40bd9ab2
font_02_sfnt_off0001311f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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