Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7184467131353f0…

MALICIOUS

PDF

95.7 KB Created: 2021-07-31 04:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f774b93d6552991e78a5765da2b76181 SHA-1: 8097c9adf72c7329405ed82ed93373f48958817a SHA-256: f7184467131353f0b562e912f0940db3b08e54aecbc2af1d094929cd89247dad
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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/160810f382047a---lekonejidapopivabomavogo.pdf In PDF document text
    • http://kehlux.lu/userfiles/files/bozopizudiz.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/24999272901.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/zakadupelokedidekawubuke.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/aqtii2448cqd0hect5jibhajp3/60326937550.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/3806507479.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lm0sghritkitcp66mh1fli3jii/kisizidekelexuz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/vafime.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f20fd10b2---95794398187.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/77986071203.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1c34cc7a---gabibeke.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/zikigafumovavixazexejobu.pdfIn PDF document text
    • http://abnicum.ru/files/file/koxilegijobuxesefapusupul.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ul2h6q5suaqle0jguhr3gouoes/mowekuvofimiwajon.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb9a6051b8c66aaa3ff96d8819addb2/28810065967.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/vifedojixosapusunikug.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/645fa5d1276dc39859dc1447646631fd/xuxavuvupodogutodelajaf.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kagikupetoponenifosega.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210609/file/13364117510.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c721acbe---xeporipu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f11cc553087---nilepapogef.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075afefba47c---38117049646.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/51201241877.pdfIn PDF document text
    • http://ahchala.com/img/file/69823744589.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/j5ivbv57b1sn3k87883hhfd4cb/57587614779.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/13771709208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=asphalt+8+full+version+free+download+for+androidPDF 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_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11036 bytes
SHA-256: 0dc622c165488cb65ca13be8b566919594a5879610664d1982e915c82a1c535a
font_01_sfnt_off00012e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0E 16608 bytes
SHA-256: 870d0010240f0c1fbba1c6308cdccc0eeb948ab1fb9ce4cabeaa774ffdd8fcc4
font_02_sfnt_off0001591a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1