Malicious PDF — malware analysis report

Static analysis result for SHA-256 862d3b552eda8f77…

MALICIOUS

PDF

78.8 KB Created: 2021-07-07 14:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 664a851f27e632cef88164a29ef15c35 SHA-1: 17b2fc71603c026e6ae115bd7300d753c9410d7d SHA-256: 862d3b552eda8f77d8602f6aa5a6b6a90d5f0d1684309d0dfc8e23ecc810f920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it is designed to lead users to malicious content or phishing sites. The presence of multiple distinct hosts and a link farm structure points towards a campaign distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4601b4db333ef77bfee24928101fdf22/3071129327.pdf
    • http://ekotop.eu/userfiles/file/89801709553.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073deda06a24---19003996335.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cdpcj112e5trl1upomn26mofqk/fazajo.pdf
    • http://gemwishrs.com/ckfinder/stones/files/futikuvoweteroxolirefuj.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893022ace3---38101953985.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/vasabijekosu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f591594e02---52659802909.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bac45d9ee---99073306562.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9291a9de2---68091440498.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m8k3d9sbh96o5f5357jljl1nv2/45498371970.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160927e5aa8d4b---pomitaloreduposomidi.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/msq73n16biungbuo6dp81lcd53/pisumu.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099a64b56b3e---xikikogawinoxepipupuf.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252cca226---wotajusuvebokakuno.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d279fdaf---12161221423.pdf
    • http://arniestribu.com/campannas/file/59330275277.pdf
    • http://namngonviet.com/user-/files/xivaterarivuxokafurano.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090edd436320---kogij.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a177927dcb6---debesolawe.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd705abae---66128570356.pdf
    • http://spalovnachemolak.sk/userfiles/file/zitogifowuvebuwowemezugit.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e330ea40d1f---11131918739.pdf
    • http://sunnysolutions.it/uploads/assets/file/26057264346.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bbvglvsk9pqaemu9sph2tl6s30/besusudafuluvojovewukow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=girls+in+tight+blouses
    • 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_off0000d2bf.bin
6375c1ee1220c47d4297cfdbfd766cdefd0eaf9e017ed7824dcd7573682b0071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 16804 bytes
font_01_sfnt_off0000fe07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 16792 bytes
font_02_sfnt_off0001161e.bin
7ed3002bc8e3096f8179bc6cf4ebf0eccb8f8a956ce3b0475f13d39aa85306bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 10504 bytes

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