Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a570e7c4b93ad1…

MALICIOUS

PDF

91.2 KB Created: 2021-07-04 20:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1bd044485a1798b3cccd921111919cfb SHA-1: 61f2964fb97c4f3055e5882c4b6e45dd2da60db0 SHA-256: 35a570e7c4b93ad1f83df68622c0e71cf9425a655617b3d17478cac6dce07ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=fishy+odor+after+sex PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4333aae211592c6adacd8640d8ff9086/48332857500.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tsgt84nodmdbng7ba7mrebft8u/xufumemaxofogidimibe.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e4a69b63---rewileterufa.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4c8c097674f1cb046c501b81f2365846/65336275869.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/96079662645.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/77864474623.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2760ae1b41846ea3dd4f8f5f0a0e45b0/pobifomavobupetijijomejim.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s3sub5tqcioaa2q091u3rbj52q/vadux.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5f5369c6---16634913243.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/46b0b22f27e22aae30a25ca520680a55/85482360798.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/bigipu.pdfIn PDF document text
    • http://immopolignano.lu/images/12952365352.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076757e63ca0---nilezukexede.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zanogigejukugososowuvuro.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/80353397530.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/56626795815.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b3c1f5376fec409af7986e76d012edb3/36308490317.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/32006e3ab714d896d2f15cc28f2ad40a/sikixunujaxedomafobufo.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gijodulakaxaviladevu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/mosubukuge.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/zirebef.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/94951467716.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/3b72dcc6a71f8abeb26c9795fe883db6/xesasevov.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160761b31c442b---66214330106.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_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 17456 bytes
SHA-256: 13c9fff174a3e302bb1b0ecd5c500604cda3ea266347219f9b23fa02a47ee5af
font_01_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001466d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466D 10492 bytes
SHA-256: 42caace5b616faea18b0491c2ce02cc7410c81346e823fa5b47b8da6d423600a

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