Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec24e763125b1f9…

MALICIOUS

PDF

81.7 KB Created: 2021-07-14 01:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b4175f093d28f6482374b375a42d93c9 SHA-1: 936033caf0ab58cb9d11fefcc2b35af3217d4da6 SHA-256: 3ec24e763125b1f9d4225837ac5e83f34dde1b5d4269a1f07d79164171db1562
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b822e044806---76628872907.pdf In PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/15474117156.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbf4046a2---lizimawugusagasoxukototu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb683d459fc---42557124032.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a38881fa---20353667904.pdfIn PDF document text
    • https://discoverthesky.it/file/sokodukisixonesozave.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/92515564711.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a1b9de0be97aa9133cc2ee95fcbfc2ee/kasunu.pdfIn PDF document text
    • http://oodow.cn/upload/file/210618002522136324s8lv0mbpj1d5.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/50828598943.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/runuvuf.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/ziviji.pdfIn PDF document text
    • https://zhansq.cn/upload/file/75821968294.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/26026851906.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zupowadu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/1219074040.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff4d0a2d8---nuvozexesa.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210629190240.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/rubadalovat.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gelirelenelize.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/91e07963ca1114a8a10ecb64a346a404/vakesubeniribapepotogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+way+i+loved+you+taylor+swift+chordsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34cf51908---4688593033.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 10796 bytes
SHA-256: 365667eff8b898c09b40ca59dd0feabc534a1161225356b8c6e2047ec21dd61b
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 16836 bytes
SHA-256: 4f71c2f3cd5fae4217bf44f4a3004472d8fc0ff1c5b402da622e0bce71ffd1e8
font_02_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 1680 bytes
SHA-256: 557e88bf9c8cb1d215ee5e1f9902d060ae47d4afd11b8eda30cbd32e6941464b
font_03_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1