Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb9a6c4cf033681…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 14:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d0a6ad73f2071bdffe00c55a3d856a99 SHA-1: 81057b125e83dc45745afb533cbd8c8a3ba1d0ca SHA-256: 9fb9a6c4cf033681baa7380c42deaa48498ab43040d69c2c610626724eba91c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://noddy.nu/images/file/27676267644.pdf In PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/84180aa02790fa7f20ceabbe324c7412/31077581241.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7469aaf75---ronemi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160967a432e793---90878803337.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161339b8ee04d2---faxuzasujovudowanunabuli.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/sewoso.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/240bb9224d1cbcaa85b0da79256657e4/44483508054.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075606d556c0---majuwapifuragoxotofuv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e8942de9---3368376391.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/xerapuderabogi.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/gubebudajetuwezu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/voaobvl4gopffb2mhh7ek7a475/wepexewewudofuridarawupid.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/87744384865.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/wudoba.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/afufqufr5c2iq1gfocd7epl6c8/98596362207.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/06800a3ad2a8886e5ae9ca182b896ed2/56887207063.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/lilefavosavujirin.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ba2ccd42---vuvogapuxipebutil.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/abu0l4c6j36db3h913977v6e6t/13657515428.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/jugojamuf.pdfIn PDF document text
    • http://demkapi.com/resimler/files/96378201521.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/sozokixijafitif.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/8260050554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cipherlab+rs30+user+manualPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/kukot.pdfIn PDF document text
    • 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_off0000be0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 17416 bytes
SHA-256: 8fe0a353e7bfadcce01de8b1864b0dc5efe87db6c9b5e5b54ec571868bed61d6
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10864 bytes
SHA-256: ad07c6e2262ad2f91525451ebd88e070d2756de49f9b70f0dbcf2a435548c0b8
font_02_sfnt_off0001039b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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