Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8cecf22ebdb25a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 10:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7f31c4db84edb57b94794a6bbd17e5cb SHA-1: 1ce8a2579f72c180187ea887770abc1c4bcf3231 SHA-256: bb8cecf22ebdb25a099d81aca8dab6ebefe22b54dda5c65dcd4231774fc81d15
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to domains that are either compromised (e.g., WordPress uploads) or appear disposable. The embedded document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://oniceh.ru/uplcv?utm_term=s3+mini+antutu PDF link annotation
    • http://eventechsite.com/files/files/zovovomutolav.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/koxuraxujofikejedanelisi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/zagijalivoma.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210911205404.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219141423143606.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/7528505456.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/38938789390.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/1973359660.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/zixaxunujijavuzifonu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/panematebenorogirow.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614021af7ee2f---xilafoker.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/sagori.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613860054efda---befuvidev.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/26993223185.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80138732863.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3e127577---mimutodizovo.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/netedifenekuli.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/bajazuzajewawepupes.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930313f7e0---94733243488.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/12893764335.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133b9376b4f7---54461893541.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/83242997857.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342746b2f80---ladip.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16916 bytes
SHA-256: e59e0f7c53974f931b0ba1083403b4e4fc604ca8a24f15defcbed58c3fd74d38
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10052 bytes
SHA-256: 051dcc71eb77600e040535209cfd3b774ddd6dfd08d8f074a433c0818e00d0d4

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