Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdc5ed0eeb4c595…

MALICIOUS

PDF

75.7 KB Created: 2021-08-22 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 078699469530b81bf065557fc7a624a5 SHA-1: 2bf3c8e20c48642317ba674e55307feb398903c1 SHA-256: 8fdc5ed0eeb4c59517bc7c2ff2958dde4cf2567a5529401175e9b5bf1f2d0340
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. These links are structured as a link farm, likely intended to manipulate search engine results or to serve as a distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=mathematical+methods+in+physical+sciences+boas+pdf PDF link annotation
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffe11960e8---lunasawofav.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cf83ad962---64507772840.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/69118df20fa2f63fe533010ce3b1cf7f/simotad.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/68ad6bdv7mhrj9vouto04iff58/65837588052.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/74100015580.pdfIn PDF document text
    • http://gyobel.it/public/file/jolagurexipakag.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce91d58d08---vixalapimitilorerobisofuw.pdfIn PDF document text
    • http://sun-tes.ru/files/file/6373744120.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210805_03744E69DB716213.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/damurupe.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aa9ad096d5d700b91d714d106bf34ffe/porebusuni.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2d40fc474e3ed4b26502f8bf0267753d/19836658287.pdfIn PDF document text
    • http://bdn10.cz/files/file/37458600857.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/tosedejinumigura.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/fiwomuf.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/nenonabamavixirusexarekul.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/67327882372.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ba78f147645b63a87e4579db2b78a2b0/34650912578.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/32916554721.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/luvigofoboxipob.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wavuwogexaxoju.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_off0000c2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 11032 bytes
SHA-256: 6d58558a643b2b830f7ab59a6352768f7894aa35559b91c6abfcef4ea83f52c5
font_02_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 17188 bytes
SHA-256: 306a3b261451b5fe0d3ad0443b694299c1318cdf8ae748d4cc9b1799ea9bcd1d

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