Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fdfbce1072d407…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 19:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4df298ae62915761fec51a436e7044d7 SHA-1: fc8e236a46f154eefbf210c763cac10b48c381e0 SHA-256: 41fdfbce1072d407a6dce023741f5030119eff7348223dfd8847f21152014c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e74627ca0---mutelefemevogoluvijoxapud.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/58994274417.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210909_016E224F881A21EC.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/fenamikujuzugubapenunuma.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/73215890440.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc81e88cd---52578385095.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/jifekegufe.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/98702065511.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/tifopizosoki.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/gonej.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff62ce910b---fovokebetag.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/15788801196.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161358bc21101c---pozipulopuwuf.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/26313734002.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/15426191930.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/kefepapizosarav.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/romuvit.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/72301927395.pdfIn PDF document text
    • http://wsm.hk/images/files/30570969053.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/tadexuvawutuxowidosobu.pdfIn PDF document text
    • https://flyags.com/editorResources/file///waxapupepidusegamasegobes.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/51976949443.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30872134028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=knight+age+online+apkPDF 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_off0000c3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 17392 bytes
SHA-256: a7dbb01e23c13d2f2f31d4707eb42727417c257fed1e822ab2704d15463b88ab
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10348 bytes
SHA-256: f72e76b2b3bd75c8437a206ed11f52248dfa75ff92225eef2fa6494b7a6a973c

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