Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7d507f57e7e754…

MALICIOUS

PDF

84.2 KB Created: 2021-07-05 05:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2824025ad3b57d97ff7a0d92aa26bed SHA-1: 9e79e3cc74ee76625cd87784c4d34065177a4149 SHA-256: ce7d507f57e7e754a17f380c1dcf5d4fca4ff95d2d5efe9850caa1afd724fe02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute further malware or phishing content. The presence of external URIs and link farms points towards a social engineering tactic to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pm5oem1dm0hbc2iu4bf92mbsc1/34292728464.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b0b46598008a527aaa0004a44fde52ef/23018991144.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/84018391607.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/664901de67a1d0abb81baa215eb1c669/90528675209.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/tawugapivezufugu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/47soa2q0j1ieqi4fdq19vftatj/paboxodis.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609320b99d508---wurikojasafewoluz.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0acf5bc85---63294201769.pdfIn PDF document text
    • https://4appsoftware.it/file/61210511935.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b476123a1274e83ad49aa498d1851fe2/6401103581.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d27449d08ecc8a4c08005828dd8dfb37/44590828044.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/52952267456.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96d76df5e---ralixarodipejuditerobogex.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/31ddlegjl7lcbjjb62o4bun74r/43531126177.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5811f9bc9b81a4997b71f158fac59fbf/paguwunikevibetozugo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4ob39ls3ga9ve9jq0k2honnub/62744815186.pdfIn PDF document text
    • http://skncn.com/u/files/1064718783.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/97015588702.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a80360723fe---68878885201.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b88446b9d---50137581249.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5c2f5e46d075fde02e5f011dc780d0ca/49313442002.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/raleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=no+objection+certificate+letterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 17120 bytes
SHA-256: 66d2206d6aa311d42e2bd45d5a4067131a7edd8c7ad2a5e4d246a4f112d8fc9e
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 10408 bytes
SHA-256: 2bcafac2e55a5c817bbbce4354c5a64b4ec8c852ef0a21fb129a4b2cb46e4656
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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