Malicious PDF — malware analysis report

Static analysis result for SHA-256 f758c5d41d9a0a2e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-23 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72506fbf929f0d85a0d45ba1a42e59c0 SHA-1: cdc4f22d1eedda8091130731fddeb4a14033f716 SHA-256: f758c5d41d9a0a2e2358a0e3b5fa730ea858e81ae322db15ac4da8ddde2fbecd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or redirection attempt. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://grawerlik.pl/userfiles/file/moranabukesekufipijavew.pdf In PDF document text
    • https://pima-alarms.eu/slicice/file/34712954184.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/90246798380.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/zadiwuxariluxekofexavix.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7grjqo8d5buts4bpj4gpi3fr42/wowaxomovaderanuneb.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/81559083462.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/97747257853.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/pevaxixaxi.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/57069128144.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/71010528510.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139232bc7475---24822954116.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42491c74---49001610681.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/8842982696.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd713bd65---27900745964.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/2763679395.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/34953631296.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/3912633375.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/20719482690.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6edj4tlt3mis2tq980r7ko3snh/31366473025.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///wenikotakovujuwajuvepav.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/jigodumakelozeweloz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/gezojugukoruset.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/85686140524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+12+widgets+apkPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/mekariguvinupuv.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_off0000c4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D3 10852 bytes
SHA-256: 98f0baafb8804008c3f86a8068be7ec2f22058f631cf37e25e693a28ca31b702
font_01_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 17844 bytes
SHA-256: c741ee903c889ea5767cd764c2c6a64c46982f23e8552d026c2a88c5135e8cbe
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1