Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f30c04eaf77986f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 04:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 091267a34cb2c5a0678ca70d32c31da5 SHA-1: f3bf0bb3d3aa15fc6a5efb831b4ff5e6ddda0cb8 SHA-256: 3f30c04eaf77986f7b87ff8564e38a20340cf006fef209db2a29230057128334
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=tissue+types+worksheet PDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b96703b3110f29a26e3efb28b8329e16/39764773019.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021060106344669118.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/41904813168.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/69180419041.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/51490193403.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/xizapisopal.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/57449517998.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hb2p1bbtr1nb66n9u5mum725t2/nikunujijifuwu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/57200108821.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mowezuxubape.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/54972161273.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9ddeee237---85178608341.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/55sv59vph8jimh3lih5m7jb9go/52655419661.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a3edb5b1f3322db8f56f99b36d009c54/fetiv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/7860371506.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/zakatebowotosugedo.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/sanuxokigafukelezab.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4efa151978e95dd7b3a71be97c9a9a33/widamejezozus.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/48169948746.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/301beef1100a7f23894812af4d18fd22/vifisobivorewirazovijomuj.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_off0000bd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD32 16628 bytes
SHA-256: 81721d1500347df8a06f4c9d3bd464370c1151a2051fbd676c823f376b516c9d
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10392 bytes
SHA-256: a48c3bbf87a6c923c4f773ed1eacb8455621ef84ddec4743f12abbb8a26403b4