Malicious PDF — malware analysis report

Static analysis result for SHA-256 f349b33510f82da3…

MALICIOUS

PDF

99.6 KB Created: 2021-06-15 12:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f4556ddbf5f401fad114d89e0da0c102 SHA-1: b4611d7a6aceb2830f1c4afa4ec8c56924bdadee SHA-256: f349b33510f82da3fddfb387e40182a60101cb0e7188a7709824ac379489d1a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

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=minecraft+pe+bedwars+map PDF link annotation
    • http://lukasikgroup.pl/Image/files/29935650145.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/56985824093.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nuzukigav.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/savojoradil.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6ab220ebde8b424de5c5bb41aa34d170/30096766516.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc540dd243---94514759945.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/78002439f787ec1eadc6ef711113268f/xegure.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0m9e81vo8n4l8ksmbkroqq2dl7/rixur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f358537c---nexive.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/83538fdd86627088129fafa708ae9cb9/63237427144.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106040648.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64307685389.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d803e38f08dec0a5d0c49dd7b03ec15c/87247496832.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/95e54c3c08370627ddb7c59c982f8a0c/94057366076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 8980 bytes
SHA-256: 2764a971244ea672da84c4b3bb8687ba140a9285147516b7ab1d8ffe173120f2
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 5184 bytes
SHA-256: 7971cc56794461a419b25f5ea80a1a4474f0433dd3813e2987d44d6e3b273a7e
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 2276 bytes
SHA-256: ff985b1262d1fb499c013e49508c2650c008de9415affc713e5b094349947937
font_03_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 9760 bytes
SHA-256: c018e9661775c237e2eea9678d5e3d21dac1d2218b0fd189c63d3f3425497690
font_04_sfnt_off000141a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A7 19416 bytes
SHA-256: 654166ee45a3a83fdb24480ee04622c73461942e9dcbcb103e0c8a95ce195a18
font_05_sfnt_off00017234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17234 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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