Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe1997af05141e…

MALICIOUS

PDF

85.0 KB Created: 2021-08-26 00:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66989d9c861999b46fc176c191f6b3b8 SHA-1: 93d3c197006e1b5018a544fe662c7ef4f2c7c470 SHA-256: 4bfe1997af05141e53c2480c9ff23fafeb216b0d628370f144f07a398a0dda28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://detikakdeti.ru/img/file/fafupoxetoxofovujekinon.pdf In PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/66303688731.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/23488188015.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/sojizuwuforibufadidaze.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0757d57127---nojefov.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/12658145356.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3d7fb7bf2cc5c263bef16d57eb5bf42b/55882185838.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/56135552123.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/dedfcf5f88da0dbf40a4b24563848ac5/74904471160.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f416cec7f4789c7f78237bcd74ebf65d/56248240832.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d7994f12048cf30e1be2af4b1aea3b3c/81359902276.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a567728abbf---suxufeguliwijawokimejite.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/zelagajozepubuzasodepalu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/49ggo5c37r6s019k8j4p7gcn14/72388782020.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/12177301465.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/91834968981.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/momafinotijizunudapu.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/93614449019.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/xapoxexatokiwasulodu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/82700837470.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9ed2d156e125030c9e375cbb9d1c3166/58594218921.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c748d6d652---21052657977.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0o1vmfp1hn20o4cuh4vlq33564/28890212753.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108221112171579.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f7acf0185---99527861865.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kevili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+online+french+english+dictionaryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 10924 bytes
SHA-256: 3d7308cbf1d3e0f756419a98c4eb0fc568d6de706f4a2a3248b20bdec4b81d29
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16528 bytes
SHA-256: 8ec7807bfc67355c70bd923baa29109b85cb9af482c8b3df8ab3403241dbced7
font_02_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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