Malicious PDF — malware analysis report

Static analysis result for SHA-256 892c5d5bbb441fd8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d468793107c6d7f9acf005f409de769 SHA-1: f042c077285f11a3e556a9dcf10bcdc4ae0795eb SHA-256: 892c5d5bbb441fd8e7625d2b8a63b12362cff987a944710dcafa0bd4ffa3ddb2
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/229598d43eacf50a27fea70d2eec2470/10365931130.pdf
    • http://mestav.sk/uploaded_images/file/71339867206.pdf
    • https://htapigroup3.com/contents/files/42835265843.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6e6c172d---vavokofez.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8dgh28gt1ht9m976lsgk63oddk/55590814722.pdf
    • http://talesma.com/E/file/50719318789.pdf
    • https://costarica4d.com/contents/files/detutokekefibusamimu.pdf
    • https://erdenet.mn/userfiles/file/vupugajigududobakut.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9b05c5d---31221775651.pdf
    • http://sabaispa.net/userfiles/file/ginufusatufopumuteju.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/96805060147.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/lopalilovipoxifikivan.pdf
    • http://interwork.sk/userfiles/file/metimug.pdf
    • http://ajmason.com/admin/ckfinder/userfiles/files/kowojaw.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/86984348330.pdf
    • https://gulf-rope.com/images/bulk_images/files/kakovilife.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/jedarefodakidaf.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/fepifititutisugop.pdf
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/remugaxexebenitazi.pdf
    • http://newtrichur.com/userfiles/file/kunesozime.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/aa6faf31f442e4cda4b48728e755f2c9/64455007083.pdf
    • https://gullyracing.it/admin/ckfinder/userfiles/files/68742047209.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/dedan.pdf
    • https://pakianco.ir/data/image/uploads/news/files/taxisotimufibun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+pokemon+mega+emerald+x+and+y
    • 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_off0000d780.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 16792 bytes
font_01_sfnt_off0000ef92.bin
1ee46b988dbeb9073c4f25a34d0e36bd6b2bcd90e6255d19db821313861da0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 18740 bytes
font_02_sfnt_off00012126.bin
ff58d0c6fd5f84de867f709348992b381460fe7b4fd06d70f642fa1efc47bde0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10772 bytes