Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a4cbf6c3f332e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cae27bd358269404bdd6c7ca0295ddc4 SHA-1: 22264fc7044636625010dec93a3a30d613361556 SHA-256: f75a4cbf6c3f332e19ec647f927f8f84c4d64f54902c97e33e87609a17ef0185
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The document likely attempts to trick users into clicking these links, potentially leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://garglob.ru/uplcv?utm_term=adw+launcher+apk+download PDF link annotation
    • https://dongciao.com/uploads/files/202109191425171238.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/47344169585.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/16824173603.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cafbb2292c06daaa1357c9d96d3995be/98483159358.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_1DE0ED946BEB785B.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fagatujefasovu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5314un98lg3nmacmmro9faf3g8/lapugiwuperidisovasex.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/2897754350.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/kuwule.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/tidif.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eldb635kgnkhc56smn2urolmov/6355438441.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/38096258529.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/98177545370.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/37633623518.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/13304344621.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/7935597784.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/12283538494.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fbb1739e95a9538f2b7d34145ccc005/9185399693.pdfIn PDF document text
    • https://duel.pl/userfiles/file/73902664570.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/xolajerabefawowuvuzir.pdfIn PDF document text
    • http://123dvere.sk/files/file/18269242242.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9bcea5e4---runifegusem.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 18740 bytes
SHA-256: 0a038627fbdb1efbbf99f253e3ffa40db5543aba41fa63158de81c03a3cdac58
font_01_sfnt_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 10512 bytes
SHA-256: a54f9f87096bdc05a596e73840b3f470d5ea3d48606bc273dc9693b8a1e778f0

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