Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dcb2396efb6ad6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 14:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e6672f2e6e9027d6da86af0b5bb42ce SHA-1: 484ab82b306f0fd9f06b47456a201705995597e3 SHA-256: d1dcb2396efb6ad66cf9f52fac0bdf3df9261e5e8401beb1dd5d2b122cd071ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised websites and disposable hosting domains. The presence of external URIs and link farms suggests the document's purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=flatten+pdf+acrobat+10 PDF link annotation
    • https://mmszke.hu/files/file/mumovufojapowi.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210814_202933_2196.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/jp71ggf9rtt14kfgslv92hru77/33048357801.pdfIn PDF document text
    • http://ipceurope.com/assets/file/51874090283.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/19124808364.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/82bb1eef63b05d20bf3fe2b36a6507bc/4027533848.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/jimaf.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/fagokivojazisijoz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6ee52bc024d359e2a5f193fd9b9b3b72/nurula.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/firakuv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ce959aa7---xixukesidunivuzudazoxu.pdfIn PDF document text
    • http://deforma.it/userfiles/files/padenavolirilamuji.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850ddf81e87---tibov.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/icnp319i5vtfo8fkpjkura1q4c/64469689947.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/bugesosoleposabeme.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/48485943951.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eadbda2b8b---14957577225.pdfIn PDF document text
    • https://phnews.ro/files/file/70633887782.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/0569c36c298a9600f19075c3b15765e5/sokuvasefoxe.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/40994800087.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/felometabokefebalojixoz.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6d57e719bfef8f06616af0e40a4b5b0c/pilivojupawifupisonezer.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/85a7b1e8873837311c63a283cb0e8d61/71951422413.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/94194720346.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f282c486---23832320311.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_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 10644 bytes
SHA-256: e9b43f4665dbdc958d1bd7932366f7b2f49bc46340a1a509f03340e002148d07
font_01_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 18600 bytes
SHA-256: ca6f15a746d87673f3d8652ec8a529926d02ffc053047812014589b7af41e809
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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