Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d7cd4b79009e8c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 09:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 408279e5abb1b4e542e6636399fc5637 SHA-1: 90742cd5ba3176371f67bcd10c3d37ab854a8b95 SHA-256: b7d7cd4b79009e8cfedd75934cafdb096233a3affa96596c8ff530e46310ad2b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://na-bytecek.cz/UserFiles/File/ruwor.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/99761314642.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160dde67005392---bogixago.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518115401351219.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/zisobamepedusivukeribadu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/204979222.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/woraze.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/27475045831.pdfIn PDF document text
    • http://furniture83.com/upload/files/teputififiw.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983da5965db---29431277143.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160824a23c4b47---58552630220.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dcd703ea---60732707457.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fh43f9pc4ig24ptp36q24al9ve/81639251527.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/28194694907.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/kepevaraporu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/48020f095ddba361f5e52d5c2aa96130/10925562836.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zexedamozukugusukejud.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a216c062d26---lomodotabipawux.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f72259888a---89559867954.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/razajefifidan.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1353722eb9cd5d620005a201d63395a9/feparuludagu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a99db2d1e47228504d213b1574023c85/ramasibadoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0d816bebf---nepiwexidavoziga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+witcher+season+1+episode+9+release+datePDF 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_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 10880 bytes
SHA-256: efa23707894047471e600d547d5f16dc49b3f08b71226b9ce73e72a76503b2bb
font_01_sfnt_off0001034e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034E 19072 bytes
SHA-256: 6e9c3a30657914c1589f322c0e4b80bd57f48073bb4440c7fada2a952c151235
font_02_sfnt_off000134a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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