Malicious PDF — malware analysis report

Static analysis result for SHA-256 f238cc02b93b5b18…

MALICIOUS

PDF

83.1 KB Created: 2021-08-22 00:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e206c15c8e7f234ad3c00e706f71d1d7 SHA-1: 1d510095f28fda92b66dcb5c2d805a9d1d561329 SHA-256: f238cc02b93b5b1853903c1b4dceb50ae1af749fa16d89ae2624b5961222562d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/17663da11f307988d34a2f4b4f4877d1/64600320141.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd4277396---77023727457.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6c7c992e3b700aae87976ec8bb5f245b/viserinodapawavedog.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/pizoxuvizenoxumu.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tavagigiwafubimedejov.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f20cbe64b---86923693294.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dajenopubofazuxomi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/nawiruzewobibebobe.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/nonamoko.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ddckd2r0s935plddenqv3qjrff/84458795539.pdfIn PDF document text
    • http://absigorta.com/E/file/81835033323.pdfIn PDF document text
    • http://st03.it/userfiles/files/jirevejutezumo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9cab47ed---dejekasepitagedakuve.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lapatikiw.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/21738835993.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/kajiwawufutu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kixazujefewezojipa.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/79721688904.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/72172377013.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9vb34a6hokk7mrnv77e99jg4h/fupixupikugajobaziwoj.pdfIn PDF document text
    • https://people11people.com/uploads/File/71943141094.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/niwulewin.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/rikon.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/avds2e5s7opudufsg30ugd8dpi/mezexopefusaxelopavolemor.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0518de8914901a8597237b63c4125190/kugidutokekisedob.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/fozupikipevopuxala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wings+n+things+menu+caloriesPDF 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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 17524 bytes
SHA-256: e05b74257d0f87f071c487010291f3d865854d0341cb233f0f23323ed2829bf9
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 10768 bytes
SHA-256: 311a2c8c533002aab17b5c92a82fb7de4f39acd091b50e43656632c0ec3bdc78

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