Malicious PDF — malware analysis report

Static analysis result for SHA-256 5453ab28c04680a2…

MALICIOUS

PDF

89.5 KB Created: 2021-07-07 04:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6008f1ed6b01dada54ca9b5a7ad66c2 SHA-1: 081718e167082b60de4c747392956bca265d0642 SHA-256: 5453ab28c04680a2278b4eb7a9a30d5fdd06d692d35a9f2f8a5c09cee9e5829f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e8u0kh67nkq50gslt1mhi0fd54/muxavosodutevepo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff26367cd---59780701892.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8d0bd0b4e1f63bda2bc588c954b9c39a/kugigalosufupebidirepex.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/p6rm7s66fuuep9761agpsf7jsv/fedigumujemeguwe.pdf
    • http://jiuxingchaoshi.com/uploads/file/020744567364.pdf
    • https://narimasu-chintai.net/jcfiles/file/jefixalajufaz.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778e30468c2---38580260333.pdf
    • http://nebovsem.ru/app/webroot/files/files/pugawokujijode.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1962e82c---zelerozemet.pdf
    • http://thermogroup.ru/uploads/files/kinitam.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2198b475bc03c1d720a2d168d02b4bcf/27858657603.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1dacb8b31f25bb930e4a8db3ec586bf3/xumezovonixulidezo.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k4vm6uott9jpso92o25mf5fquj/loxarol.pdf
    • https://signika.pl/Upload/file/83880078329.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c9b80703b800e98730c7a9586ea7fb8/42844130294.pdf
    • http://agiusfuneraldirectors.com/files/file/resixolonibitelozutex.pdf
    • http://www.derbysignandgraphics.com/uploads/file/75479972344.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b47bc821f79---43318297041.pdf
    • http://pomocnaukowa.net/Upload/file/tulumugil.pdf
    • http://fdscience.com/UPFILE/userfiles/files/94188646219.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080e50f9bebb---81943219745.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d010e8f466---95173910763.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd82a205f3---18604244124.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tile+of+nine+tailed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 16792 bytes
font_01_sfnt_off0001154b.bin
b6d65ed166c13bfba7ef197163bff5034aff04c57d9f8e1e9c75fd8cc1c0727e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 10044 bytes
font_02_sfnt_off00012bb2.bin
de7d41caed29f76a2f84de74b889248b70343242306b569091f42f2d8f3642fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 17272 bytes