Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aecacdf18f00a0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 19:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35aca0b21804cffe939c05e2d5e973b2 SHA-1: 75c0f076c763145f41cab9d47450ed36060dbe27 SHA-256: 22aecacdf18f00a0738fd3b31b4c43c7640b7b3146c8e6c3083f7703cfa7580b
216 Risk Score

Malware Insights

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

The PDF document employs a lure to impersonate a cloud document sharing service, directing users to download a password-protected archive. This is a common tactic to bypass security controls by encrypting the malicious payload. The presence of multiple external URIs and compromised CMS upload links further supports a malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://archism.ru/uplcv?utm_term=solid+explorer+file+manager+apk+download PDF link annotation
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nisosu.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lubasasoro.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/legux.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zifoniroloxolare.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/38686550669.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/tugeva.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090916265847.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tadabasoduz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139055772d0d---46744389440.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/zosaganebexuwijowen.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/dibaxidotokuxaxinemu.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/40098549398.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135782614af0---ponijuvasifurilodit.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/22455722115.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/zobojilewerexapekulu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/34b28fufarm7cjs4p0fbd1rpmt/82397702083.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/86370557697.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/3943862418.pdfIn PDF document text
    • http://umhouses.com/uploads/files/26923444948.pdfIn PDF document text
    • http://hidropro.hu/upload/37371706317.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64dce4a0b---jeruwajirewuwigixi.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/wololiwiwonekofepagixax.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/lolan.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/12563309894.pdfIn PDF document text
    • http://lejonhund.com/upload/jaribolimuzokadexegodate.pdfIn PDF document text
    • 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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10932 bytes
SHA-256: f933748c60c34bbd76bb75365216efe9b300903b10abdb76245ee1d1ce3d603c
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 17600 bytes
SHA-256: 7f09d2f3d48be20ca2aa040d5fab883a8fddb2af4af35df4d5e34d053e140364
font_02_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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