Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1908285b954983c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 13:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c41c15a47df1cd505cc4da0b80f060b SHA-1: 9b311b2faa24edb044abf24a5c0e1614f3c20b8c SHA-256: f1908285b954983ca6a3a8b48dd3f84f75e41adf4954181b795e9e98070cd976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests the document functions as a link farm, likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=i+think+so+synonym PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f0017db13cd68bf5d4935e2aa5ccbae9/47913854411.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/36496593529.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f76d2c36---22429638311.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56337519067.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/dajufuzinokufigavimu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/larasisabaso.pdfIn PDF document text
    • http://houselandia.ru/files/juwewoxigitomoderixi.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/60274843436.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/29451665812.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/646558848.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6evrgr137sfttgh3idrl3ghbcm/60137909646.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148e91975441---94957331500.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/geniginitatiw.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/4166146006.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/xubaxavebakotekafal.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/bewitusejitemej.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nulokawefinopagunajupiv.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/bijegafamine.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/28443690280.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f67d48317a0d29713eb9ec62d3dcdb07/liketixajamikodapuronixub.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/8085774996.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.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_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 17444 bytes
SHA-256: c92b3d747dccfda9f1935bacf828538d85fe5e280381a18ac9c7875107b128d0
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 10092 bytes
SHA-256: ea443190327f81cbd3f3bd9ba8a7eaf0df3fb0d5873dc2f868efba721acdfff2