Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2739f74195f702e…

MALICIOUS

PDF

67.4 KB Created: 2021-09-10 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 185a350f39528ee5e5cf8a73db77e430 SHA-1: 929b8db0351c34ff39d45d1e23a79d854585b2f9 SHA-256: c2739f74195f702edf02f834ce0ca54ce633aa3d04f62e349c0840d665a36f62
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, utilizing an image-only design with clickable action triggers to direct users to external links. Several heuristics indicate a link farm structure pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest an intent to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gewald.ru/content/Files/vuxejazusexupotipunixu.pdf In PDF document text
    • https://hijaulumut.com/contents/files/37501581141.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b50e900b273966c5d84112541b801273/fukutaboz.pdfIn PDF document text
    • https://domilot.com/uploader/files/46667565210.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/62716470915.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/vekopevim.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/gidewox.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/tozivoriluzud.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/081fcc1701042603108e77ed1c5f4e35/88654211195.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/68318838139.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/71298186850.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/34526843489.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wuxowegebepepixex.pdfIn PDF document text
    • http://armanetti.com/images/89191030122.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/29493805413.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/naxawesap.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf05d0c3c---buzowaworexok.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881190bdc2---2398114228.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/tozimevividijuvaluguvu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39466289393.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5c2b1a90---lirapilox.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/zekupekavefifuvo.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/19145317832.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/zenipolutefela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lovoo+hack+mod+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/xewaduwevuxilurun.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_off0000af00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF00 13716 bytes
SHA-256: 8a8a395f5a2573ec5e3b1c59491922d2c1d9eeac43855967291674c43be6d7f4
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10156 bytes
SHA-256: 14c6f3d8caacf52848d596170b112f629d46cb74e97395bb07b04de92f9a2969
font_02_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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