Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc95ca14b6b4d1e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 13:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d8617c21c08f00b22117c0f82baea71 SHA-1: bd6573ecf2327265aecb4a6fed1babfdd7eaa201 SHA-256: 2cc95ca14b6b4d1ee2ec20cfafa2e376cca2e38f0ee8ff70d80c993c4cce8b4e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://catamma.ru/uplcv?utm_term=much+many+a+few+a+little+exercises+pdf PDF link annotation
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pongi011j4s89jasgfpghfq1if/garatod.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884be6aef93---kofoluze.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45ef8afc92d619c02d54dc05d40a5ef0/kuzepimi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf22973936a---nojerodel.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1250a902---xezomegasosefenutiroriza.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160796af8360b5---befejurelimajula.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/98739525609.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/sepulovizen.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0rcp1u8m8ni0hqs3eev9hninn7/27053341852.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zuwilezifogo.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/fijudedofemos.pdfIn PDF document text
    • http://arslanemlak.com/E/file/bupotedakutuvasepozubuzer.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/rixejajobofo.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/57762395473.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/8283320777.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/jerukuj.pdfIn PDF document text
    • http://merwepizza.com/upload/file/81732230921.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/laxilajasebadaxemu.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/70487910401.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021052717131287.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e2453d530934341d11d60d3c3d1e539e/fuvosiwewe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cccd9d79f58---sinemumirarulolufonal.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_off0000bd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD61 11160 bytes
SHA-256: 80c3760f620ff96a19f496db6a9d72bf77881b683ac9685d8fbffc306a3645e9
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16376 bytes
SHA-256: 6f9fc73ecd39b6af56a53e9337b4ec8edf3afcff362c065c61ef15ad2d349a56

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