Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5369c980de3e6af…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 07:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e97d0e552e4316e90e8412c73e13a40d SHA-1: 15808536717f781347b31e34939a801194698a66 SHA-256: e5369c980de3e6af96c5348989d83a859a97dec33de51a3b0a8c1d4051d70868
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slide-bearing.com/d/files/94059340806.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/fipixigepi.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/52757156316.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/kajezumemavokakebix.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tapozusorek.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zibizilelir.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vq6chgf8mqn394587oepql85h9/zijowinipazamo.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/97115339645.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/texapenedatokinusin.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614619ce479f2---15279096031.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/zuwadogupibeb.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/73834098089.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63795035250.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/xalexubakonokavoj.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210918_3EF6FBBD94675777.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/85651354657.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/98210410222.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/76478573728.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/12568623450.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c7201611---pupipumug.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/5020149615.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/fupuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+game+online+play+download+appPDF link annotation
    • 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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16300 bytes
SHA-256: 6e56aba1e9304e2a4f8be10a4fd97f8d591f6947fae364b45f0dc4d10d88d40e
font_02_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 10752 bytes
SHA-256: c55d8c487aaa1dbff8e90082ffbfbf17c21f1d58b9b5d48f92c50658e8d3d491