Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cbf68b74b97f25…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 21:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0872fdde39ae582c4e4e3604c7ee2d49 SHA-1: 6e804e3d5602fea16dc2bfde4fc8775423d6a0a0 SHA-256: f3cbf68b74b97f256b6ff88cad7c909583e81c27f54f2d073e6a4a4a5ef73c64
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://taiwanglassgroup.cn/userfiles/file/46712653488.pdf
    • https://gregor-biffiger.ch/userfiles/file/7834392639.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2d9be180---naroxa.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/61115939394.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075adcf2c85d---16977943561.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50400b72a3c0ba8104b309a2746e8971/49013741791.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368f169b05---boden.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078affc0c98b---93084413070.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80edcef87---pifazibaxebobozu.pdf
    • https://weilaimachinery.com/userfiles/files/vavoninonizagejizidud.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e74a49ea---20952709799.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8f67677c---38441240073.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/17cjb8qghbthlukiupfi1nuhh0/tufegupuzusesujo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d84d3d65---5087913952.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c850e6b0e1---saveranolizujasidopi.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/fbf77808c52ce9c4a5ed5de005211645/dozadorujunesuga.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1da2ea504ee8071a0f4cd57d3192720e/ruzufiwovojibele.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7e440d17be7d9473ce69e7ef6cebcfe/sowomodapinurewodu.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad976909cde---58005232310.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d654164a4---40328039209.pdf
    • http://www.kilincsweb.hu/fileok/file/lowodesuxigobidototofo.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bad2fc23d39---puvofewowuzidigin.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/blrubnckr5kb5ndm52d4f8sj74/tomug.pdf
    • http://penzionriverside.cz/files/file/55457290546.pdf
    • http://szolnokepul.hu/userfiles/file/fagefowus.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160760b9b4f097---2690371395.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=drawn+in+water
    • 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_off0000f4d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
font_01_sfnt_off00010ce8.bin
7bab761dee6aedff2639f9b778c004066940ead54e6f9eaf3d3e151c75827595
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 9856 bytes
font_02_sfnt_off000122b9.bin
89ef6ee2d2c41c9b508f98894bed69f29136b8163702c42ece7c564f7f3cfc7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 17292 bytes