Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a14ea80dd23153…

MALICIOUS

PDF

84.8 KB Created: 2021-10-08 18:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 93ac86972b9d8b60c31709499edbeb87 SHA-1: 87e74bc141ff54e01b359741c426666d5400296b SHA-256: c4a14ea80dd2315308fa84975cce578ecbd18954f7ed2b87b0011e056ae2bfcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also flagged it with high confidence.

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://irlanc.ru/uplcv?utm_term=play+music+by+hank+williams+junior PDF link annotation
    • https://zabulgaria.org/userfiles/file/4333935686.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/54457163491.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3722d71d120ad108d6cd2d0985f0628d/wamupizatudutusifip.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/99498112853.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/88236478965.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kokegat.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/79655485683.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143132cc6717---gipenikigimub.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d986190ae---31345911270.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/patemap.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/meritizafofowizijulevev.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/zevozafalofotosirazaxu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614553535bb96---newamaz.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/gapipegufevasedogumaluw.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/nazozuni.pdfIn PDF document text
    • http://snsi.jp/image/news_file/fuzumurejodixuja.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1p6v51ubk2g0d7hlhqfb2t0lgl/49592630292.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vituzul.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/roxunijadinax.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/savokaruwopalokote.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/vebonarupolofijo.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/zemizigenavasefavoduju.pdfIn PDF document text
    • https://felicityokolo.com/file/94475691854.pdfIn PDF document text
    • http://szm.hu/userfiles/file/89449669088.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wipoterevuzomuvevawa.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10928 bytes
SHA-256: 458403cdb96945469115ea55d40d50c6542253d82030b147295056dd0df43d41
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 19972 bytes
SHA-256: b78e77b8e1ecabe08c9098ea866fe764e33bc137ebee8ff055350b8327ab79ba

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