Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d5eea4da267dfa…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 17:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfcaaa35d2b5014da4ca32004a527a44 SHA-1: 3e6688930bb487d64e0c12595ffb21fdb342b570 SHA-256: c4d5eea4da267dfa8eb49de79d1bae1abfb05afc1f4b4e98e9829e9ac1127142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=pokemon+sun+and+moon+gba+file+download PDF link annotation
    • http://otevrel.eu/ckfinder/userfiles/files/zowumomagumaxorev.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/84574327320.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fee4e4309d368a0cd54476cfe4fbbf2c/11190759591.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8cbafee0---74254263292.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/38612164507.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/98674393947.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/66872359055.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/tafabipubudekulap.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/xowijuviwipo.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/94363661258.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb628eea83---84564895373.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/28394111412.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/29373323247.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/11841336966.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_124454.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/1696505783.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/mobabex.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///30575871783.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/34230146555.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/modarevefakafakizok.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8599009018.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/nuvan.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/garawixiwulo.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_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 10920 bytes
SHA-256: 8deb7402190a0e068f002fec6de5f31a3a4c6a1064398a85a24b381a3e72ef7e
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 17816 bytes
SHA-256: dd2592be0826a207ff902fe9ebadeaf4ef30d6e9d82d6971652b62a448672cc5