Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9d8697b878794d…

MALICIOUS

PDF

97.0 KB Created: 2021-06-30 13:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ce820c3e4e80799fb3e4f1e97b1a5e0 SHA-1: 9096ecc54e6c057f18811c7bb0054ba424aec710 SHA-256: 1b9d8697b878794d8f827a8e2b4a10bdc1d9d16b28480100c91ef5c4751ab72b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed to lure users into clicking these links, potentially leading to a phishing site or a download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67c80b5f9e---74700129414.pdf In PDF document text
    • http://amuseonline.com/absite/userfiles/file/bitabima.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bae7fde6---77170457362.pdfIn PDF document text
    • http://acryl-bg.com/userfiles/file/basivokowixetekavumonas.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f997c93d---zixelixafobojumoxuwuxow.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a459ab2c2---sewenakudeluguvozakaxov.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ed50e15e---78439309301.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b370f14b961---pujaduwuzekoxulevatib.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98afcd5b7---xutaxalixoxaxuruginit.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/bizipawuwumowafe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcc2af913---selijuvixiduzugixibana.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/on5t6c5tqhc2hu426q4b79jsal/34764922946.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/liperexifupedo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160845b1c06491---razazazi.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/07c40b8c77b6b58486e08ed51ddb93b8.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/gisotubo.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/8036707609.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/11881140314.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/37048036922.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o6afg7ag7ff5htl3g82gms23hf/19335636437.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/88689445455.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/9541319569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+many+tenths+make+one+wholePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 1996 bytes
SHA-256: af30ed7f6f362e40e353c77992c507f9f3c989c8c5e1427aecbc93b55dc2a2b0
font_01_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 10464 bytes
SHA-256: dc874ea9effc67246ed314551cea159fca861c4b499a9d8f8e0dbdd24d62953e
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 18380 bytes
SHA-256: abbc168ecd1e85469aa96f0445b213b83709b43389089ccdcc8217a74c6bfa03
font_03_sfnt_off00015e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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