Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c496183fbe7d2cc…

MALICIOUS

PDF

75.3 KB Created: 2021-06-30 09:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f5cac548e52cfb34358a331e88f648e SHA-1: aeb9b520667b6e0e118c312925568084735f8381 SHA-256: 4c496183fbe7d2cc428d8531bad0f1594a6060dc4a56bcc7bf70e6c66a4d5124
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The primary purpose appears to be distributing malicious content or conducting phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=choose+not+to
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a7a86483---55736410582.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f3c5a4a88ff8e98eb8f8b62b9b15c089/17468747313.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d61dd592abb---lokivanapaviteni.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4ac585c815b18e6afa9b62b3b6535eeb/26522760834.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955789d58f---kilakatakevifaj.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/58469648952.pdf
    • https://langumeistras.lt/i/File/15308851311.pdf
    • https://alianzatours.com/imagenes/file/50556690644.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec985670c6---47021438947.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160883408c3c35---nozinawezewiw.pdf
    • https://aspaeng.com/files/image/files/84682395944.pdf
    • http://szkolka-wiercioch.pl/files/file/giwikefavodonoregorivini.pdf
    • https://stvorki.ru/files/file/29376140062.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f500e21390---tuwekiketuzujokonilirim.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89ebf2e85---87852077362.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502bf909c7---sakilafogunupupezesinami.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fbb01a81---tudugut.pdf
    • http://crmloccitanecr.com/campannas/file/voloduginufuvapa.pdf
    • https://angkortaxiservice.com/userfiles/file/77723986582.pdf
    • https://denizlihorozu.com/resimler/files/paximisazanasudewas.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1e3ccbb3---xemizuki.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/30ec0069c2e4d432a1fea1d0f00d760c/39307540007.pdf
    • https://sportnazona.bg/f/uploads/files/jujaretakigodogivon.pdf
    • http://atol-res.pl/uploads/file/peguwuleboroz.pdf
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/14761680876.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aceacae72ae---82387757347.pdf
    • 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_off0000c9b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16792 bytes
font_01_sfnt_off0000e1c4.bin
8fb48564e99f68b303bebb3980790c485c6bf9c3ccdfdcaebec6d9b097cd5bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 15856 bytes
font_02_sfnt_off00010a58.bin
fd5fba4ef7791052edeef3424af58021a37ef6422b059734d5d9ff42eb40d8fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 9836 bytes