Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46f62e832d85909…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 21:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c42a6aece3af192759c590ade6de8b9 SHA-1: 819d7c8030fe22f5f99b242d0896ac096087cb8b SHA-256: f46f62e832d859095ccdc12200e2624c44bcf076c5c9d3116d2c433c16790615
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/pvib5tau24ibd257r3c4i0edn6/xuxoxurujovojotilojoz.pdf In PDF document text
    • https://maintogelonline2.com/contents/files/fekejiwere.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108110118333076.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fajobirikokixojo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082dcb1c64f7---1646534340.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jukejavuwidinizaxeruvek.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608612b11a3a0---benewa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dk68gepg61u4lqafqbvr50p0nb/fonuweb.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/19013806609.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de672b9c3---24228055556.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/fixeto.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/tomobovozukujibo.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/jigutelorozakanixivaruf.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994562dd65---54382461486.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/rijefotijojaxikafinenuje.pdfIn PDF document text
    • http://compsult.net/userfiles/file/tatadigafubolisonabojavew.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/purijasen.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b649cb6bb9d---87340025394.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/851e14812971ab44d74e955e390f7fbf/xepeloxemunezi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/27332746229.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad7b1bb65---88469118681.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/52ujmbk9t92q9hk49bt59bj2rd/nifupabivalukilipefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gabapentina+300+mg+bula+pdfPDF link annotation
    • 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_off0000be62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 11028 bytes
SHA-256: 04c21453b7cccdef3752b1846553c5bd63358af66942e38d6cb983bdcbb5f1a0
font_02_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 17788 bytes
SHA-256: 5f0c56ac43b2a9fd95a695e4979178fb079a766a6b9b185b6023efe627ea3ced