Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c86f14881b7c6fc…

MALICIOUS

PDF

85.3 KB Created: 2021-07-09 20:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3f6108b776b0c7545cefea5b248d4abc SHA-1: 3b2b02ad37b73b09d29c2d4577b7f2dca20e7f0d SHA-256: 4c86f14881b7c6fcc1fc83c098fe2402d542d6877bad80ed7f2791ddd46e6321
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised WordPress upload storage suggests an attempt to obscure the true destination and evade detection.

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://philabc.ru/uplcv?utm_term=molarity+problems+worksheet+answers PDF link annotation
    • http://rheinmotel.com/userfiles/file/bebatata.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/4941481349.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/26476120127.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/nasafuwolazitav.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/39315886470.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab514efc50---timuximekirajolo.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e74749f3---jidawe.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6d8a902a---sanimiperowajetakexudoxom.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ac922c9c---17977267857.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/kidabuwunobup.pdfIn PDF document text
    • http://addsfly.com/userfiles/file/21470766101.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qcd5hst9m3mnrvhca8pjtdv1n6/58589341650.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/oevlcaap592ot2tp8hl5pfapb1/pimobivasarozuwi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xuginofabiru.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6fc4fc78e1870e989892f8dfe4f22de7/livogelemisajevig.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/afc65cd619ae0eba974ad8e781a89653/xunolavorevexi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608845335ce63---ziwodiw.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/4620oo6uagt6obn8mr2bj7usd3/68040331775.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4d6cca43b9b9b23d1e5c8007ca0ec6b8/tupoletabazibogeki.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0f47cab75e54eb75cca2787c790f11b8/18956798141.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/73271701545.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/paxomalobu.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/natagutunimoxezifopur.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a882cf6a13d2da5b4931c3ef0932ace7/riguxeliro.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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 17132 bytes
SHA-256: 490b516f368fe0131596f1f590e9718f6cdbf6b95cbdb62376d9925a9cad5728
font_01_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 10940 bytes
SHA-256: dece01a36caa576cf7f5cbd3bd6cf0d4b11f1900e290493f585e5bcf3e1e4286
font_02_sfnt_off00012fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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