Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ae825d80fe79ac…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 02:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: caeaea92472cd28ba514607529dd4f95 SHA-1: 9658a36ef6740ac30d8ff0b006f4b87404ee2c40 SHA-256: c7ae825d80fe79acdb8b2fb6975aed2924be2ecb8ab58f3c84193d394006b075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest the document is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=chawl+house+series+watch+online PDF link annotation
    • http://auroraenergyproject.it/userfiles/files/51473764800.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/98297188784.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/kusawomavufisowovodejoge.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/72189428388.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/14f5558d3e13cc54f0fa159ea619adb0/84262192476.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/90445768065.pdfIn PDF document text
    • https://citronel.com/userfiles/files/kazebive.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/92662558865.pdfIn PDF document text
    • http://herbexindia.com/ckfinder/userfiles/files/92236788659.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/wimuwezasipinififutavom.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090711322053.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/79105858341.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/mimavat.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16370f50---18031756539.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/wedefamazezowukamodapav.pdfIn PDF document text
    • https://pecintajp.com/contents/files/lemubamokatobubisa.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/kirisonox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b93964fcb---resorowafavazafese.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/gekujubolunofumiximum.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/wisorifufoduz.pdfIn PDF document text
    • http://kodemari.info/data/files/noguwaz.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/72125748846.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/81589893529.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/mupifuzete.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 10544 bytes
SHA-256: 068bac54b3ce448ecd8a4754281557173c74752c73d06f647ec904f6d2527743
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 18364 bytes
SHA-256: b90335cc3ac1319b7e09b9bdbc916f8e8dc62ab3be4da6c1a0d9693f80af41ca