Malicious PDF — malware analysis report

Static analysis result for SHA-256 70abfff7c50b3cfb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 03:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2ef0940f87c56e22c55cc8c85c185ae SHA-1: a4420989f2ccb760acb72c458cc96426e163e1d7 SHA-256: 70abfff7c50b3cfb4113da119ac17610e55d96036cc7ac5b35229c5d449b974e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt.

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 http://nhasachconggiao.com/luutru/files/4936644042.pdf
    • http://sl-light.ru/design/img/upload/file/67612308252.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beff90a50f9---44421971289.pdf
    • http://katyababash.com/images/uploads/file/xibaf.pdf
    • http://ural-resyrs.ru/data/file/43777885331.pdf
    • http://harchovyk.com/userfiles/file/wuzusu.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/33785779209.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bf4adr2q2p9dn0hl21gdvs78q1/mebiwuzapagefa.pdf
    • http://accessiblevehicleservices.com/userfiles/file/mirovatuwanumiwenovepuf.pdf
    • http://naturalmis.com/userfiles/file/rezowidixelezet.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fbf6o4c651ja0pu1fdoad71tdf/52313051662.pdf
    • https://bor-diing.com/upload/files/joguwilakiruzoxivip.pdf
    • http://matrix-corporation.com/upfiles/editor/files/molajifuluvivagojor.pdf
    • https://webmenuplus.com/images/file/6890314162.pdf
    • https://scalper.ir/data/files/file/34282878792.pdf
    • https://relaxbotanika.cz/ckfinder/userfiles/files/13614060889.pdf
    • https://fultoys.com/userfiles/fosipewug.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf06725ff6---xaxamixamaduvisumod.pdf
    • http://maysoi.com/hinhanh_fckeditor/file/gimozosab.pdf
    • https://aquafilling.com/userfiles/file/77662207629.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/883de780bbb4554773149ec8fb694f8b/zopusedenaxazovegowig.pdf
    • http://mindatpeace.us/uploads/files/wusime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=investment+banker+resume+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_off0000e61a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
font_01_sfnt_off0000fe2c.bin
90302bc58d12a829536d161c467766de0efd8444ecb038fd7ce51c577ecfccce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 18860 bytes
font_02_sfnt_off00012fd5.bin
f64f656568ba04a7058832a96926ccb33ce5e38302f0857558a440ff80ed602e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 10748 bytes

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