Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd4662bc78c167…

MALICIOUS

PDF

89.1 KB Created: 2021-08-19 23:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b550010da7886200c3608e65adc2c5d9 SHA-1: d7b4d19105644f0019a68eb3b16d40c73bec10f5 SHA-256: 82fd4662bc78c167ced096a9e9c9f761d5d3ceb4eab26fb66a1bd75399000b94
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable binary data, offering no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/782c5933ff949f1a1f51bd6488b51c83/53926310.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5354322a---tugexofoji.pdf
    • http://daming-school.com/userfiles/file/65639562247.pdf
    • http://altaprecision.com/userfiles/file/nowirapabofigedelavug.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74512b0306---75957443711.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be860bbcdec---jevusegixeparekenoro.pdf
    • http://koslita.eu/ckfinder/userfiles/files/28105175595.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a707e634e58---59877212838.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3d8d8bac7111c6985b729bd2ff70c492/93772487350.pdf
    • https://liantoong.com/archive/upload/files/bimufetopotizufebaja.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/19028647895.pdf
    • https://2acontractor.it/images/file/gokerewujol.pdf
    • http://gardatrans.com/content/Files/20798629993.pdf
    • https://fceresources.com/ckfinder/userfiles/files/genidux.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/42065586758.pdf
    • http://alianzablue.com/aym_image/files/31822072401.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/pipajafef.pdf
    • http://astro2sphere.com/admin/images/file/77950023975.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c49faaa61---zusigivuzegoj.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa4ab5381---6001090753.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2b688e79f0012e152f16527c7325ad4d/gibaxo.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/09fcf2d528c79402e45c3d84998aa4fd/53690006107.pdf
    • https://bestofbucerias.com/upload/file/50467142543.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/vuxuri.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bank+challan+form+punjab+university+for+ma
    • 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_off0000f741.bin
433a263851d96ba9cc004bc919c6e11537e66811725ddea003be5ce3f61fbcea
pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 16692 bytes
font_01_sfnt_off000122d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 16792 bytes
font_02_sfnt_off00013aee.bin
44d0db4f5a477ce284900a99da7d72d75c1ac97a1bc09936a0fbd042e73a007b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 11440 bytes