Malicious PDF — malware analysis report

Static analysis result for SHA-256 61707410157ac938…

MALICIOUS

PDF

100.4 KB Created: 2021-09-05 13:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ce94c47197c84dee938757109e29eca SHA-1: b9aaa1de0cc3c521a4e546ec6fe603cc43b9d159 SHA-256: 61707410157ac93883eeda340409b609dd989405e6209156c81d33e258c55113
172 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads, suggesting an attempt to deliver a malicious payload. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=apc+smart+ups+1500+rt+manual PDF link annotation
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/naxafiwa.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/64782685000.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/menodemuzuv.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/53093128738.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2160ba34cc8774906ffdfc2ec04b4662/49666989678.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/94659234272.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9adf6c914d---57569531558.pdfIn PDF document text
    • https://viceda.com/userfiles/file/munemuvopofasiratugi.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/26396114717.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xonawaxubalebeve.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/lajezufijarepotelizi.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/pimopani.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/66038641969.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/61419703122.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65e279a6c---xuduxupejoda.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fubafupogimemime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f2af222bf---zazasevodijuwegof.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/25444221218.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2bd4d8cadbccc1738c39d4e86593b8a/kagadedoxas.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/muteturavenalibazemexane.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/nojurizobuzi.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/92950490485.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/kikesulikoxope.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/8768042057.pdfIn PDF document text
    • 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_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10580 bytes
SHA-256: e66816638229a2cfdcfc823ac964d917241a45c93e397d731068cc9875f6f24f
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 20852 bytes
SHA-256: f7a2df06a67d8207b59c93a55b782c6b8080a93ea6ebde10da8f084a6dcaa42a
font_02_sfnt_off000169f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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