Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74d650d57c3412…

MALICIOUS

PDF

112.7 KB Created: 2021-06-30 01:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86a4f510d609c699fe15a54d39846ad1 SHA-1: 0777619dfafc338dc671081b6e6980c784c9c4e3 SHA-256: fb74d650d57c341285d8f0c56b9df027c32d5822a4345740b88d829e4c80cd89
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of compromised external links is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://garglob.ru/uplcv?utm_term=blood+brothers+narrator+quotes PDF link annotation
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1sofm7887vovth6a57l126dmi1/94693800059.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e925e800---kukidimibibaxinivek.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/13722304682.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8df31091---nefol.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lefafoje.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/metataxotapitixuxupugapas.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb30946013---50060204697.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/d7qn6h9h1iqiuea89tcee09fv3/21979925237.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/lukamebaz.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/856a8a69b3f0c77c8c5f5bd84cc5f573/56134678825.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c678c51ef---nitorikisusevudowurikum.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43499871460.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/sgq3bqhbkbco5i8vcv7n1gd78v/vusix.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160802c675fd40---bukuvotav.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/6981985784.pdfIn PDF document text
    • http://merwepizza.com/upload/file/sipitiwimoleb.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cevip9b7sqrkh1pf49k6n8u56v/feberuzosidof.pdfIn PDF document text
    • https://x-software.cz/data/file/11976888984.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874520476c1---37970805109.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/63056240153.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zupefizimedimuk.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f409f7270b---97433840683.pdfIn PDF document text
    • https://wrd13.com/force/file/vototoxobanut.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/nibop.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b63981df---niragovufagixug.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_off00015963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15963 10692 bytes
SHA-256: 267798c3e5703b31850aba1a7f39615f27872b2f07078062ec0e8ec81b31bdfb
font_01_sfnt_off000171ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AE 16800 bytes
SHA-256: 8541ea98621b2b0cc970850539fab084d5c99bcfc5ae46aaf2decdc1aa4267d2
font_02_sfnt_off00019d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1