Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2395143ae66e0a1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45bfb50efef30cd67fc034337178bcae SHA-1: 8be24ae0a9fed42b504aa28205af2287b8e661f0 SHA-256: f2395143ae66e0a13ead1e13705aa75869a7bf016f514c6c2804dd9372b98bc7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier. It employs a common phishing lure technique, presenting itself as an image to entice users to click embedded links. The document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or download further payloads. No scripts were extracted, but the presence of multiple external URIs indicates a strong intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://ketchas.ru/uplcv?utm_term=microsoft+flight+simulator+2020+android+apk PDF link annotation
    • http://gesht.ru/admin/ckfinder/userfiles/files/37684923532.pdfIn PDF document text
    • http://ossokahve.com/upload/file/60327059822.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/87346644360.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404b6cbe41e.pdfIn PDF document text
    • http://usagimatur.com/files/others/dobopisojajewagozawik.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/39429422549.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613735294bfc3---58579445951.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bofitapokilumas.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/4492080264.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/98332888575.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/lagipunisezogirokelu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614911cbbd279---wefesomopop.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/65846944491.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614435ae9af01---60351858643.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/domoduvumoxuvig.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/mubovegifesokuzi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec590e5de---99619386725.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/72250184016.pdfIn PDF document text
    • http://scro.ru/pic/file/24923119665.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/tizutetelanixilutefa.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wipufezefubisawipuk.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/12645913648.pdfIn PDF document text
    • https://brod-plovdiv.com/images/mosipaxame.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_off0000ad6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 11364 bytes
SHA-256: 91abb3d0b44b0d011c325209e6ca938332d0dc8ecd66db18bd5f145211e1c344
font_02_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 14212 bytes
SHA-256: eb855d925e3b3a92a99ca481665e1abd432eaf56f8fa9284540704ba67db2f4c

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