Malicious PDF — malware analysis report

Static analysis result for SHA-256 701572460fa47f75…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 21:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa827382c8a14a86bf553dea279adff6 SHA-1: 8d1892218ae399033eb82515ba7a701f1d1f5527 SHA-256: 701572460fa47f7571ddae9b68f8c3baa5314b0d362f6d0493a9ea7e31cf34f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm on potentially compromised or disposable hosting further supports a phishing or malware distribution attempt. The ClamAV detection and ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ahcxdq.com/uploads/file/071858498672.pdf In PDF document text
    • http://mlsconsulting.net/cms/files/File/3430153155.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80dcbae86---32871443477.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f07ddfd9d---21772194820.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jobesekuzebakigitizalina.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/sezizoj.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109060656223939.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/39755469043.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/91701985453.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1de74120476b7b9f9cea10b7f13de16f/27318738929.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sigazederemuseda.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/29440340510.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/11e7abd26d2172ed860e5f9aa55437bc/kedelepotisi.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/95454610024.pdfIn PDF document text
    • http://chemicalengineers.ie/images/59206007671.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/71196969957.pdfIn PDF document text
    • https://sambelteri.com/contents/files/kurugikagagapusonabufa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/39608495345.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7gspfni2gvrhleos5flmaee2lj/57054465895.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109121310584146.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/20700535724.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/2817015621.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3957464f9748e044bb24f7c5903c20a4/45992567740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sword+art+online+extra+edition+english+dub+freePDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16384 bytes
SHA-256: 6d385e38f5b9830af9ee03de4ff65fec3d4731a259f54671037d03db1bc404a3
font_01_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 11136 bytes
SHA-256: ea41c72ab2f6268d52809087b098a6c17362aa2a74e5e5516c7423bf4faad2fd
font_02_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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