Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b5192b6926318c…

MALICIOUS

PDF

98.5 KB Created: 2021-07-01 12:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6eaed171a07642401b36ccb178813e59 SHA-1: 6c43dbabcc5a13f7d29510af953362a7b0078ba0 SHA-256: 33b5192b6926318cdc4c8a8504eb8fdc0a59dacaf630934cbe50c8b7d8a59404
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to redirect users, likely to phishing sites or to download further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://allytemp.ru/uplcv?utm_term=what+does+further+affiant+sayeth+not+mean PDF link annotation
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/vitoselijinetuxebowakesuf.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7d3f308a22140efe8df7b9cba5a23670/38818021088.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3b4b56d4059c6cf6942436bc99373e8a/rovixafida.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/81610532131.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607308040eea9---86450808130.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/54640144942.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/30890461175.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9b82da30---muruxepok.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fb689ad6583806630b192ac235cc5b34/11172022222.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/kezumovusomiv.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c780dc09cc---zoxapogomije.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/08f190f733dc2497ff01c0b65fb8bac1/delagexedigorivamow.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fb5c492f---69740507952.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/dosarelozedubo.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/62336561917.pdfIn PDF document text
    • https://mszukam.pl/dat//file/33196701525.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/67bf48d3adc8b7385fd82f944acc1d3f/nibiwajezixeboxat.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/48fafe3594ce3e56b18c072746ec648e/zitegulit.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b4f52f40b---vimipojil.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bdee7b9c535---84732478544.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/tutegegar.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/69agc6mfmllfc2m1ssjjecad6i/fuxazolomifike.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608475f06c78f---97514946107.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 20572 bytes
SHA-256: 1bd88d9e5451ea50f288184495f35de0927aca48896f9b6422f73bc59bd646b8
font_01_sfnt_off00013d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15530 10780 bytes
SHA-256: f4f233e3882f0ffa371d483f344506689a878d7e6a443fe9ff96800cded87e69
font_03_sfnt_off00016dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDA 2992 bytes
SHA-256: 3c4f192e704dad93c48a10bd0cb014b19b40d86a524da1a1b4d4e2b781f39504

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