Malicious PDF — malware analysis report

Static analysis result for SHA-256 6942c642367d7fc6…

MALICIOUS

PDF

96.6 KB Created: 2021-09-07 00:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2f54e0013ab4f40276105c1f309fded SHA-1: 0b8b282ec2286dfbb25bb1f733da5dee21bee1c9 SHA-256: 6942c642367d7fc6658b69b30a919cc67a2ba8c33e50788300f692937e559844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • 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.
  • 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://thangmayedex.com/webroot/img/files/73336739317.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb41f681---gidowonoxibigon.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/66971242253.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/9732170624.pdfIn PDF document text
    • http://terrietanaka.com/library/files/gekev.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/69967956511.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/ladureforikefibam.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce56a2c30dc8a962ba53d87547e87e9d/91131932460.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/bafabibivujera.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/48809461568.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/55440658979.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/80838166775.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6140da19d1---keverapoforabozebefofuzuf.pdfIn PDF document text
    • http://3asoft.vn/img/files/41004672704.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/318420386.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b05005971---24892597073.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8185481e---6002048939.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fokebum.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d95bbe02942---11803336800.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/memorek.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/dadedejafefokefi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0567eae3---40826702934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=answer+sheet+pdf+toeicPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 25920 bytes
SHA-256: a849502928364766eb2631036f511cb61dd39924cf88b728832e25b118ef183e
font_01_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 10576 bytes
SHA-256: 93ca404e2a5763fa4bc4fe22cb58b98d9e766bc06976e1e777da505a8001c51e
font_02_sfnt_off00013d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8D 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off0001531c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B29 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a

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