Malicious PDF — malware analysis report

Static analysis result for SHA-256 221ad73d400fcbf8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 08:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b5141d6379067db9608973b09f262da SHA-1: a3b2ef583c2307853f2b2cffaa832c23e69779bc SHA-256: 221ad73d400fcbf840988be8a3855e716830d18415b4a083ea603c2ca5e7f5b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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://studiotecnicobonoli.com/userfiles/files/15367149908.pdf In PDF document text
    • http://nexxstep.nl/userfiles/file/viluzuberi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613077a070a66---10592234888.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nisapupugul.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/zinekovege.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/70091689421.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xemepobeg.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210913123453.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca2ae7ec6---silapujesuxilamofijixukoz.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/sevokizisal.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/siwapopuwogebaxuzijowefux.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/23475554367.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/46200868043.pdfIn PDF document text
    • https://securitydm.net/slicice/file/mabukinusegubopilanoke.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133640232e79---31593073740.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/wonaneribunilokiporukite.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/devimevugamafukaziwog.pdfIn PDF document text
    • https://btegypt.com/file/vabokisaroweluzutasuledeg.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/59500123366.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161352bb0020b7---widojodagotibisuwonox.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/77756945290.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/77753251048.pdfIn PDF document text
    • https://koratspring.com/upload/file/90602154534.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fegigowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+can+a+defrosted+chicken+stay+in+the+fridgePDF 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_off0000b724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 11040 bytes
SHA-256: 046ac516b64f58cb07cadc6388c898d3b5cd056f2ba33ecb985256a70c787b8e
font_01_sfnt_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 15676 bytes
SHA-256: 087a0822245d29396e99847ede5f1c63c23e76529eaea9ecc39814451cc41d6f
font_02_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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