Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f7a03da40eff39…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 04:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8647123fb72499924b14f5fa87e3a7f1 SHA-1: 6742b845d7de8af07b9f77153f564276b960f8ff SHA-256: e4f7a03da40eff393d53562153e03084fbe15daf3dcdbf2644ec11888f8a5109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised WordPress upload directories. The presence of multiple PDF files and the nature of the URLs suggest a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://www.niceresidence.net/image/upload/File/69940706328.pdf
    • http://gardatrans.com/content/Files/lisozad.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/kaxapoju.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/80542080154.pdf
    • http://vizugy.hu/uploads/files/52963036828.pdf
    • https://vsetinrally.cz/userfiles/file/88443011613.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614e617596f98---16359885794.pdf
    • http://purepassion.pl/userfiles/file/notadaxowobozofuketag.pdf
    • https://hotnews.md/upload/userfiles/files/11532494024.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/pedunakimoxu.pdf
    • http://jpsacademy.com/slbdavbatala/userfiles/file/rovule.pdf
    • https://108pizza.pl/uploads/userfiles/files/foneterisa.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/23782762757.pdf
    • http://gsprojekt.eu/userfiles/files/magejerixabapididuwina.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tetefekobutipevisokuz.pdf
    • http://abaj.cz/UserFiles/File/sober.pdf
    • http://baohanhranghm.com/upload/img/files/4078285671.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae9538f442---44076461253.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613428e68af05---90963311153.pdf
    • https://dienhoanghean.com/upload/ck/files/doxizulilokeseda.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c87827c9---2344445891.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/99424769135.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/mirej.pdf
    • http://nelly-design.ru/upload/files/fuletifinolojefo.pdf
    • https://ermolino.mebel18.com/uploads/files/doxigaropezasomutu.pdf
    • http://www.pacautomarketing.com/file/78797552902.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+webview+user+agent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba57.bin
ba6058312e4916bc32cc375dafc60231fea17e89838d5e8f02d313822e515abd
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 10748 bytes
font_01_sfnt_off0000d313.bin
e2685852a56520b10e9df7ea95b3ce3b877b9e0a28b32eece77dda96f5f8f676
pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 18712 bytes
font_02_sfnt_off00010423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes