Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6d9936198bc84…

MALICIOUS

PDF

92.8 KB Created: 2021-08-08 23:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 703850a7fb2b7c18d5778a26f5f8fc4b SHA-1: 8f1d1928d89343dc0b0d190259f15cc26e161bc5 SHA-256: 77c6d9936198bc84ddd247d073386339796cdfc41292b648a7b3378083e9c5bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://shelton1961.com/clients/35589/File/temerodamik.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7de50de0---sumib.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608695f2ac815---26652198222.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/31833736490.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/14212323676.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/11059620141.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebcdee5b7d---joxab.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe07d879e---gozometebekumu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dac43ec55991d6adc0510f12661075c9/85730679397.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210709_8DF36D6E1160F002.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef415284c8---95811687418.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/6690538893.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b18b6b863da82eb361bc3f1d834d09a1/mewuwobijobopasi.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fotupimaguvisuxigedan.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/44570333143.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/25521490284.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/1bf502243f0d299ef6f2d942d4afb012/34694394775.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rokaz.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/60tl0vqo0rjdmcjduo5efofm4t/58056850428.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/delovapisexarum.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae8f6513c---madasugidilizumidibubo.pdfIn PDF document text
    • http://letdentalab.com/img/files/27481133828.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/85329662879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hand+lettering+practice+procreatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 10512 bytes
SHA-256: fe7ba901687e82fd235ca3094d30dfc8c920be473dfa672e35831c979f4cd52c
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 17780 bytes
SHA-256: 84fd5900aecbf08382b771f877b2d4fc094467798cfd3816b45dda02f9694b1b
font_03_sfnt_off00014dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEC 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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