Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccb4d4c09b69eea…

MALICIOUS

PDF

78.3 KB Created: 2021-06-29 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: afc60477aff0c988574ddd40ecaf7a9d SHA-1: c7bfaece4efc45b419e917137492c0912c0cdb43 SHA-256: fccb4d4c09b69eea0ea3ab3f68052da0a202742b492d4f899889f60aff24c641
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=use+of+rom+in+computer
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gghubim5su9n20a38hf8d540tc/zefonixupizegipadixurir.pdf
    • http://meskerjager.nl/media/files/malivebos.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ad45663ffd6---64114703050.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607471ade755d---jutemarevedad.pdf
    • http://brandiassociati.it/userfiles/file/68973902549.pdf
    • https://haidangpc.com/contents/files/junad.pdf
    • http://bindashnews.com/userfiles/file/894061302.pdf
    • http://ideatity.com/ckfinder/userfiles/files/34267344108.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/44681096100.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/609290e8cd3c9030fbc558b36d2d4667/34042285846.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b343a849b22---zirokadonaf.pdf
    • http://cphs1970.net/clients/877309/File/rakuzafunupewanon.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56247337818.pdf
    • https://aawyx.com/sites/default/imageuser/file/16290662001.pdf
    • http://indecomavo.pl/inc/26467372477.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/18ba2ce5992f6a91e18bc16ef796afa4/xexopofanewoguvawuguv.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75773f141---75087163758.pdf
    • http://157.230.241.115/image/upload/File/zatititizam.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3834e3117---92730688562.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fe650b023---74768560768.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bab8a387---lubunerap.pdf
    • 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_off0000d1f5.bin
4e641cf708fd98122df421e5c4c6eff2fee8ccc925c217643a682cd7b16c9766
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F5 10540 bytes
font_01_sfnt_off0000e9fd.bin
e1cef162da9ed55b80dd117018f899a482beee4036aaa40a7a415e0309b9a6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16308 bytes
font_02_sfnt_off00011451.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes