Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc45efbba7a2a31…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 04:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86f74bef85b9640ede0d2079b13820d7 SHA-1: eb4e69d6ac7273915bf6404ee592228eb64b1ca9 SHA-256: 0bc45efbba7a2a31a7fb3e597da537309b5fbd064fc4bbc32602ffd706c9a68e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous external links, many hosted on compromised CMS platforms. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple URLs on compromised sites points to a coordinated effort to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=stremio+apk+for+android+tv PDF link annotation
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1bc3a60c---mamamo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/livazarexogotuta.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/43047433936.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908133711.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/6111064427.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/26178063528.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/matasasageruse.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/najepifomidosegopekubugij.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3f5898f0f74dbcb6be5e924d777c8187/rekobisepubufi.pdfIn PDF document text
    • http://bibikid.ru/upload/71792916447.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/73176132867.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47e7977f4eb13ccf98cc217dce65a42/wasikubaboluxodel.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///26354396510.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/1429430994.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/srr5ae2vah129b6suari7of70h/20086924256.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/funadopiwawu.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/39754807850.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1b254128c2415a340a319928a8e0ad00/mobutixagabosewexezafesoz.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/70511663054.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pijawesiwibojixetuside.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/fujobufuwotidejaxekonuwom.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630943278648342830.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/furejimibadomedubinegiler.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 17864 bytes
SHA-256: 7ea34fcdb4ce2865a6ec471beead6742dba7305c55c2626cef8e15e8843bc8d1
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10680 bytes
SHA-256: 06f36731ac9bec47352e7ffaa6cd6cbd841d80d22110e6c05786c704b2204f55

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