Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c5d111b40c37ee…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 00:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78bda0dbf56e1da5c11997556415a82 SHA-1: 10e218980381a08a42da674c542756cde2ca2fc6 SHA-256: 69c5d111b40c37eeabc0cc5ca95c99c723a2dc0626e25990317260b0e88a2dd6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of numerous links, including one with a 'utm_term' parameter suggesting a search query, indicates an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://artgrafika.cz/userfiles/file/wafujewemigemaravakuwoxe.pdf
    • http://tajesink.com/Uploadfiles/files/sibofakefexaxuk.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615348ee1d2c5---fapoxefiwu.pdf
    • https://smilaxlabs.com/userfiles/files/23362986789.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/79721795417.pdf
    • http://koala-al.com/d/files/24592679590.pdf
    • http://btfa.tw/upload/files/83603544192.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe86a4332---gariza.pdf
    • http://www.farmaciapenil.es/userfiles/files/wudinidemi.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/63433420331.pdf
    • https://elperrocallejero.info/ckfinder/files/nutexubanaw.pdf
    • http://villabrown.it/userfiles/files/saduzimizetu.pdf
    • http://microcement.ua/userfiles/file/jusimojirege.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161308182a2490---51303786648.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/86794933100.pdf
    • http://world-spa-resorts.com/dok/rofemiwefopoliwilanekef.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147aafa521f8---89332345074.pdf
    • https://lee-trading.tw/archive/upload/files/pikulamubiki.pdf
    • https://r4binsh4h9-att.com/contents/files/tawogemevolokedibixodata.pdf
    • http://lovesenergy.nl/file/vatesinifomulebokinitute.pdf
    • https://refakatci.net/userfiles/file/dakafevogudi.pdf
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/nevukezusumijugeraxedu.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/10015106236.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stick+cricket+hack+mod+apk
    • 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_off0000aed7.bin
7fdd62a4ddf178a1815ed54d3372e739e5c1fbcb64b03e0d4b25e00d04525cae
pdf-font-stream PDF embedded font (sfnt) at offset 0xAED7 10628 bytes
font_01_sfnt_off0000c72c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 16792 bytes
font_02_sfnt_off0000df3e.bin
86464bcea8f08769fd8c64e0a0da07cafca52591d6e19beff58d8f6da5a96e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 15288 bytes