Malicious PDF — malware analysis report

Static analysis result for SHA-256 222721f6411dd6d0…

MALICIOUS

PDF

101.4 KB Created: 2021-08-16 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 668c5bdf92578aeaa031fb9957044389 SHA-1: 16b7309889be6055c1a7842700318dddadc7f4b2 SHA-256: 222721f6411dd6d07ad6fc86536daea27a1b63bd3b46bbe31f4e22067e19a8ab
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 0.9970

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://krisoc.ru/uplcv?utm_term=plano+de+leitura+da+b%C3%ADblia+em+6+meses+excel PDF link annotation
    • http://douzonebnf.com/upload/file///gedoxuxumeron.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/96147849819.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/wobudivonerudurujanab.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/1411279892.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/tofabusovowadagitaru.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-8/20210508191125153797.pdfIn PDF document text
    • https://combrooncom.com/contents//files/redigomamoribefinibum.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9cf2e49a4---8875149141.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/48605641715.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161160e6ccc862---xusibiva.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/mekijatujiwemuxuxu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6vsh5d8b6ofmpn0840eh7evo4/61255706469.pdfIn PDF document text
    • http://classtool.info/upload/files/wivefazajolu.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/velezovumajileravasobup.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0e78694e---18737114811.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/34170a52fbffd264907efc5080b174d0/bepiketudidim.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ad39fcce---kiruxif.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d882cd4d9b3---limovamot.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8c76f0585f0bb419f17ac2ec6e0ab068/19547588373.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/67722090026.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/tmqh8anh9mf25bv8ugi45npu8e/vifeboxus.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/55844525192.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/mupimibedanaxekumat.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806048f1f55---sabaw.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/42337402689.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_off000123e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E0 11104 bytes
SHA-256: 372977fdd98a91d4c1ea6ef772ec35f0bf1bb7bc8cd2d8d65d4cf725af0232c4
font_01_sfnt_off00013dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBF 18932 bytes
SHA-256: 84856f6466aa70862842766884734793d8f1f1c05908c2884c6ff8f2b3019cac
font_02_sfnt_off00016c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1