Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952dec99bd9e561…

MALICIOUS

PDF

84.0 KB Created: 2021-06-09 18:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a8dd78f68f0afc5919cb736aa69dca8 SHA-1: a8aefb3310f79a94239345ba48a1abb212163a09 SHA-256: 4952dec99bd9e561a3c24a57f3abd60881424b2a158106b713c0a91f71de0700
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various websites under the guise of a game mod download. The presence of multiple external URIs and compromised CMS upload links suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=league+of+angel+paradise+land+mod+apk PDF link annotation
    • https://brianhigbielaw.com/UserFiles/file/66181985450.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f50b8e62a411370d2f4434503957dfad/nijugipareporadan.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/sujor.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/faf9c4f8e2795c9a6b32e99f86cec787/bewugiked.pdfIn PDF document text
    • https://plasy.com/uploads/file/31066594110.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tabiniwasodomitud.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96e3901d1---53073638894.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/zazux.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/20743524776.pdfIn PDF document text
    • https://corghialberti.it/file/70931257289.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea8db7c2d---79999019180.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/800df86ca04277bd44b51540d610f355/vizeg.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/44237235490.pdfIn PDF document text
    • https://aedwea.com/upload/foto/92883359660.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907f4c7b392---50407830393.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/vidopagoso.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/84446068713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 2900 bytes
SHA-256: 87262879a7285327af2250313412b15c3758d60b8e01136c360111b3c0f437e8
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 5168 bytes
SHA-256: 5ac092b22117b828b4e36a420b846f046b02026c6ef99af42588fe950686793b
font_02_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 14296 bytes
SHA-256: 9ed8a9020be7a38b4872aa3a8ad84bd9e6f620252344da85be3b6925e08e9282
font_03_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333