Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0b70a2e86cfcc6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9adf51435418ddc075a7f78557eea6eb SHA-1: df0a790f84d5299bb8305adbfaf2df3f3ae2796c SHA-256: ff0b70a2e86cfcc663597255e26c08bb5c1a5cf31af71c236d00ba24032814ca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests an attempt to lure users into clicking on them, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jemitajenukivetevazavur.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/2082788878.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/gulopotix.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fuzojipamowagavolufavuwe.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/96701153523.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f014ce5f39f41805a11597b45a5645c4/wudorufokum.pdfIn PDF document text
    • http://scsychem.com/upload/files/kakeja.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pokabelefuzatu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/2997359932.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/visajanexamegevitanona.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/vuzizivefepawabud.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/fukokumi.pdfIn PDF document text
    • http://furniture83.com/upload/files/88741680721.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/jufavokoxumigo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a06c58ce7---95885757432.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b755cf63e---toliwiz.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/25ccdd232883d9373728121607fd0d47/933244197.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/35037030533.pdfIn PDF document text
    • http://szpk.hu/_user/file/97605870776.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/40185420830.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ruvex.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/muzojegivuzisoxugonorus.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134abe0501fb---36377336279.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269b42d6a0---vimifosigerefigi.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/93929407846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+task+app+for+androidPDF 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10588 bytes
SHA-256: bca2303ee9c0933144216db78286626445aaade12f10d741be4417c1b6288037
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 17564 bytes
SHA-256: 95fe4efd59066da547a499dbfd783a5a4fa52726e4cde1d7c4d0dca924b299a3

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