Malicious PDF — malware analysis report

Static analysis result for SHA-256 797f2b822b70e894…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 02:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0278009fff34de01422a018d4c1b229d SHA-1: b2f73c69124ba8ff94c0aa8bb7a9022603391b69 SHA-256: 797f2b822b70e894f9753d5150c62a241a73676df119dad4a5c0937106119a38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript, flagged by heuristics, suggests the PDF may actively attempt to redirect the user or execute further malicious actions. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://adance0112.com/upfile/editor/file/ludajufojelutipo.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/00uadcthrkkj6hfb3csraohul3/zetuvofinojisige.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h280k1spra7lsimn4a8g47i2fq/welaxuxozawotopodazevax.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe68047c9f---kudadaranowafuna.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/zirodedatofatavolozuvivan.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/fuwifo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140622a12925---lovuvu.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/xivezepuwokuxaze.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pirorojid.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4599117272.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dawipefijuv.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kufutole.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nakob.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/degosofezevegoxaziwit.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/48779498351.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/50568519536.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/xelupeki.pdfIn PDF document text
    • http://odumakus.com/uploads/files/88977911484.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/xasaruzope.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/97732882979.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c335cfa7aa41055958270ef7203d3772/13274170049.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/49186927655.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/vevezuduwatonemukebomi.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/fetibezoxovofakafiperi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bubble+shooter+bubble+shooterPDF 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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 15900 bytes
SHA-256: c2622bbb66a490f3e88f1e512aa2cd4375f5766f7fccbea5405d24ef6e558451
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10140 bytes
SHA-256: eff3503eece648311bb2363a695a9b934df368b1c110bd6bab7fbcfa93505bb6
font_02_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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