Malicious PDF — malware analysis report

Static analysis result for SHA-256 50786b6f35cd100c…

MALICIOUS

PDF

77.2 KB Created: 2021-06-28 02:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 58755f73768676381a50d11be877d8b4 SHA-1: 2a306d4ed643d46fb2cdab26245bc9e7ed8086a5 SHA-256: 50786b6f35cd100c39f8a6d5976911cf516a2d219dfef32a46566a8012efa0b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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=the+dynamics+of+entrepreneurial+development+and+management+pdf PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f162c8641992180e94aa8265c0a716b/wonunaji.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/53qfo8gphbd4qvapanl2e72kh4/dudos.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb3fe46a6f---wobowekajanixoxuni.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1cb3e0be---42961146850.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/19016722284.pdfIn PDF document text
    • https://kermanrooz.com/img/files/foguko.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/70261919204.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1d3b3a659ee7b5ddbb1cde857726fc80/wikonetapowerevabaf.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c31940a901957d1857db7d6c09e7157c/88556843297.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v08n7d1ci38ah3jq0b7rb66b9f/xinokoperafuko.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1d871a45ccf6914cea390c08d938f7bb/75896093402.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/16898967792.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/79870721412.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5lca419p6oa8cccp5769aofkj1/jinusalebodemuneladuzo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f084f10c12f98cd20033fbfcc31dce/nutijukokukamivat.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fcac27fb0393d18e86b15f40941f6142/43755388051.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/88955904595.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee8a684ec---32547920381.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8afd7b768530a84db2e17f2b6de1851c/pisuloxafumeruminekuza.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gimupuk.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607966de72474---75260870773.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a2f22d4c46085a11614b80f6d4040a5b/39616848931.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/butupebopifojavoni.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b664f29be63---93306221102.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ff38db501646b3045311701544e1f92b/1009244200.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/jfeu03c5qesm4rugq65e7g3eln/3032490267.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6f9302677bb0baba20a10a46bae3658e/zasajuni.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_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 17044 bytes
SHA-256: 4c11dbe13016617ec110b3a14bd29ad83af7a4ac7aa494dd190e8089af59162c
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 11312 bytes
SHA-256: 9484a9f03ee70501ba3d3e3ede8cec5dd41b8e6025701fb3fc7892dc533dc596

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