Malicious PDF — malware analysis report

Static analysis result for SHA-256 05060395db81da13…

MALICIOUS

PDF

86.4 KB Created: 2021-08-18 18:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dc77705a4a2362dd7dbc52e70646bef SHA-1: 5eb4b51750013da35c0f82820dc81848ae30322a SHA-256: 05060395db81da13797838fceab40148d8b7c1a00b90fd912c4a95fa80636589
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f71d9d7d2c3---votiwenekewupa.pdf In PDF document text
    • http://caudafotografia.com/userfiles/files/92172722428.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/tevafuzulexapapexo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/80fc5b5eb695f6678e7f71ee35cac1f0/juraxonumipezuferatogenim.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073761e8ea62---xeperosujolano.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1f822f31dca15508c21f6ef474d5ea15/fusevede.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b8c26470750b6c46ad4e057e801f56b2/24625045209.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/zulufeminexegusekewodudi.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/giparejawure.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/246fa668461121bc15525556319638f5/34363375969.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/m94g6anp1urrrapa62ie4gouht/pekake.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/xorozupuv.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/kusujilakisuvewo.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63082715279.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddf199fe4---tugokosojuzipux.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/timudiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda4a81b4c---wemeg.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pabukukomoxekipaxufamadij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/b9ce60143e15806d4b4d37e2ef7e9e08/588381117.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tv3jm0mj0641na2m9tsk502acn/53969987496.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a6089fb1919f982aefc6f3ed366227c9/92318736199.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2d9da635b---2400102422.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/resinize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=icloud+unlock+removal+toolPDF 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_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 17728 bytes
SHA-256: 0bf60ba43c8dcbbc62d6c3020a39b75e8fbb11cfbcdce32bc90ba5aa260a1004
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 10480 bytes
SHA-256: e1ad7934d588b2297150d6e55abfaa0ad54eec1299c8cbad9a768210932ab2e6

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