Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2d642dbc504692…

MALICIOUS

PDF

101.6 KB Created: 2021-09-07 23:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3f8bd4caaf3d0fd3f078e22e62a06ff SHA-1: 823ec57188fa41f9d4c8a0ee63387090cb36c9e5 SHA-256: fc2d642dbc504692239818d42531fec4cd9faa1e118b8a4be6609037b1a11724
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malware or phish credentials through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smilaxlabs.com/userfiles/files/polerupi.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fa932c8749993afa58373bf54e2672ab/nuzomefono.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/00a2c5a141199f259b6f54b2d0fa6a60/poxawewiduwat.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/312ebdca0d5d1562b480f66697b6c0df/baruxomilakeni.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160945e699619d---88069918489.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l3488bt78pa9inlur41cdgpe9n/59544927956.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/bukuroluzibojaso.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/badimoxuva.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/30858903434.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/milewot.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab2da8cc---tozelirefeda.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/risul.pdfIn PDF document text
    • http://jngf.cn/files/file/32286824952.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/57986894707.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///66325699008.pdfIn PDF document text
    • http://soles2walk.cz/data/file/83548543427.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/49996637500.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161129785d83bb---29884275955.pdfIn PDF document text
    • http://arsvet.ru/img/upload/7808889855.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d028bf4ee68---venigubera.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a8f2b8f3---vilonuwixu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rq7sf39u65veeot5rrr4rsll25/xutawagiremigadowofisu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c7a98f1e---86583707167.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4042306999.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4447b55b---pigajetuzunezarokulujuvu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/95307598470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+convert+pdf+to+epub+calibrePDF 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_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 17084 bytes
SHA-256: dea3a5f8245cd8705be0e39093d828e4b62580e166fc2abd78db4de53825fc6a
font_01_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 18480 bytes
SHA-256: d5820f219997315eaa7deb6fc2a9b4e9bb0db5b4835840d0cbf8a0f824e697b3
font_02_sfnt_off0001707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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