Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e6962b6a0ce47c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 08:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fde4edcd4ed4dd6e967ef23c5d83adb1 SHA-1: 7e9c40651cdc7e3581962bb598b740051716e407 SHA-256: c7e6962b6a0ce47c9db58528fd6515ea17b1d238cec2524dd263380c8a680671
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to deceive users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614709a406329---rufenawoneziwot.pdf In PDF document text
    • http://tinhdauvietnam.vn/upload/files/1273938461.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dusafox.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/87413804456.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/85903149314.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349765f2b00---58812700262.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/xenuvofaxironosel.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161402d488ec94---10543544103.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hk8rt375dphu3apc2om3bqno7u/2561351304.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/60774356663.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zewuvadamova.pdfIn PDF document text
    • https://basisangka.com/contents/files/90175549243.pdfIn PDF document text
    • https://33mobility.net/uploads/files/72539416402.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/61cadd7da43c88d13489d8be0b63ddaa/maguj.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r1aq8aiqs6ji8nfjasm7rpcbfl/2051274419.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/logomoziwilek.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/97715747486.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/95817154452.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/nutirododukizenanebik.pdfIn PDF document text
    • http://specialcats.nl/media/files/susemur.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/4d623rr8a11ma5dfpi7cfedipp/bibek.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/93992338792.pdfIn PDF document text
    • https://birotex.rs/images/files/3664232289.pdfIn PDF document text
    • https://mauspro.net/upload/files/55310735344.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jizezopibetetimesakebikuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+delete+unused+apps+on+androidPDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 10564 bytes
SHA-256: 393421984280ec5b3faaa703cdd06d7ca06ea90c2eb2cc99a7f54f51d49f3c67
font_02_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 14012 bytes
SHA-256: 3f48472b8f66b914a3d357d28bee369e6d1348e6230983269ff461c12ac9cbb7