Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a405797c133425…

MALICIOUS

PDF

91.0 KB Created: 2021-08-12 00:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fb37783366c7de3179a724123c64ed2 SHA-1: 60681d88aa68783182dcff83efb8b6cce3906e77 SHA-256: f3a405797c133425b007808841c29c0846f3c0ece2092f6d2cb3c7e15de4ff76
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, many of which are hosted on compromised CMS upload directories. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. The embedded JavaScript likely facilitates the phishing attempt by directing the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kozelskadm.ru/files/uploads/files/98572727932.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/87vmc3kubd7nndl3m6vgudqpo0/papeleg.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/dusuxif.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/87lf2m3k82kncoi2a86g2jgt1p/29077660950.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/bajugojuxilunaf.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/a1acr2njb3rq7u25h9bisklhip/dasitofafubanunum.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609894f450115---80107603094.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/belopapuvanozuguw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eebc37caa7---84662798303.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160742cc955d75---47366774656.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7067480938.pdfIn PDF document text
    • http://cocoal.com/uploads/file/vudesakitixetowamasogos.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084be01543ed---duranomex.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sogiduvutajolefomezuxeda.pdfIn PDF document text
    • http://linza-market.ru/upload/files/89407523528.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19402ff3f---padarasoporegu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2e0daaf2a517ea284624406569e1ee8f/91113161821.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/2584813525.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7e81f80c6aba8f40face726fc11ec21e/37291658540.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a482925da1aee56bda93427c6fb5b702/manilugodasewejige.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xipije.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/42287824603.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2597df1648---kitokogal.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/93170838138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=netacad+cybersecurity+essentials+final+exam+answersPDF 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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 17868 bytes
SHA-256: 9be1ed7d668e63af4609242807b87ecd072fb5f5085bee1607780626e27e3c80
font_01_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 11036 bytes
SHA-256: 9b59a4d0a3fd36ddedf749002ac730bdfae32dc020acada231e8456c1d657d07
font_02_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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