Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbf9ca1ae070d39…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a2e14d7142f64659ec3935478d82aec SHA-1: 68cda0a32a3aa15a3822ae8928aa2fd68a4f9777 SHA-256: 3dbf9ca1ae070d39670125c409c773ec5a59c0ce45b2e10bb91c719f5ef4afcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=video+star+apk+mod+download PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fp3r5lett50nsjudanpl3ie7rc/fibojuwu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/zodeletufajel.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/birijafopolisodepikiwipil.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/pujakigafidigon.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/dumekuwivipozowenodisugus.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa747c4de8.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/57560287871.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144aed3c743f---46277340750.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161381fa603835---mekeduginajelasilez.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rosewizininasoso.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/lonigunegilalu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/ketiminugovizedemuzadexo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/midofisizobavikafolu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/laluperumeniziti.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/peginuripanaforitu.pdfIn PDF document text
    • http://smirna.pl/files/file/mubodijofinexu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/27467616140.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425d4683529---zasukazexibidaj.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/gilepaxudagebutosopijoba.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/86478361387.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/34155746288.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/22471617123.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_off0000b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB866 10700 bytes
SHA-256: 9cd35c7bb9b75d5c33fcc110010b1d3db2705b4689323a730d348c4015f60f94
font_01_sfnt_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 16712 bytes
SHA-256: 99c44ec406cf78cd1835ebeadcca14c2302d281503be98ddc65a929bf6541426
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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