Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b28872417e82ad…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 10:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0741bc9e6fc9ddd7ac314f43facb1c30 SHA-1: 749ac00f9f21a431fad433f2ef873bc162ff4625 SHA-256: a5b28872417e82ad3f8240fb2cb093f97b5a8587a237001d4a500bb33aaa0033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and link farms indicates a likely attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://flashdisplay.net/UploadFiles/FCKeditor/20210916193006.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/31d6010f140a1aa4b4c722e1f4f7b830/84197354108.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c78ab7a80---tosefipijuki.pdf
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/63203910915.pdf
    • https://miet.hu/kepek/didibutidoxewoke.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/fodifewidiv.pdf
    • https://namphuctourist.com/userfiles/file/kemofutatojozu.pdf
    • http://ecohouse-lab.com/userfiles/file/99622145636.pdf
    • http://lignumweb.com/site/webroot/uploads/files/sukimipedutagipa.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/35185255517.pdf
    • http://zavalinka.by/var/upload/file/83106055199.pdf
    • https://processwork.archerhuang.com/ConImg/files/zalad.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/33c805bf7f052e494578d72511f30c9d/fujipes.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/69572553740.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a81592eb4e4be6c47e16d2ef72753cdd/dunem.pdf
    • https://securitydm.net/slicice/file/duvekutibifake.pdf
    • https://citrasas.com/ckfinder/userfiles/files/98915962512.pdf
    • http://dblbtech.com/userfiles/file/xumobigojoxoderaxudoref.pdf
    • https://guineaservicesproviders.com/gsp/files/vinojisujarokuxifi.pdf
    • http://www.ezmoving.com/file/rurugipenofaw.pdf
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911172848387620.pdf
    • http://sanmorales.es/userfiles/files/59487538915.pdf
    • http://birzebbugastpetersfc.com/files/file/7155187171.pdf
    • http://musicpark-live.com/userfiles/file/jaguwevopiwiwofaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+hay+day+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_off0000d4fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 16792 bytes
font_01_sfnt_off0000ed0e.bin
aed66ab4c035a0d507464ba8e1c49123b2aec425005d2b3bc9c7425f4d2f10f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 16160 bytes
font_02_sfnt_off0001165d.bin
b5df9b4d64c9b84ad80622bf92291cbdab1be706ef20965599d06a04bcfbe097
pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 10568 bytes