Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b8ed3a4984ef1c…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 22:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7b738886d5175366c89bbcddf34e348 SHA-1: 1ec76680a8549af1cbd0af583f86c720eae26d53 SHA-256: a6b8ed3a4984ef1c3a3246a7a69b7595727fd8a796f5dfc392d618b2cebffdb2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-heavy content and the presence of numerous links pointing to potentially compromised websites. The heuristic 'PDF_IMAGE_LURE' indicates a typical phishing shape where a screenshot hides a clickable action. The numerous external URIs, many hosted on disposable domains or compromised CMS uploads, suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/7214986527.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/sipiwuvejot.pdfIn PDF document text
    • http://wami.cc/data/files/fonis.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/fulapujugesumateranage.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/65301202694.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/jitotijofenivorojipejozi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141639a5154d---83344306810.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/tebavegiwisafeluxepera.pdfIn PDF document text
    • https://asiapharma.la/files/files/fuxirosugajodo.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/23922487824.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/vorozokopovimiba.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144834059192---34349854318.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/66753668666.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/553799481.pdfIn PDF document text
    • http://inica.org/files/file///ravobu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/683549ea810e57bede46858a5f4582fc/xagusaxile.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/sufir.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161419c3b6ff2c---tolewadoxalof.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/54293952324.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/42134416776.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/rumomabegudoz.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/mikewugonukulatemoba.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/titavopalubigagosube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=business+intelligence+making+decisions+through+data+analytics+pdfPDF 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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 11428 bytes
SHA-256: 510688c920de5989d0f7e415e413c0747fb539978bf58e61a09d5c57284f6ec1
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 14316 bytes
SHA-256: ba5e4d1677c3e64bc70f450af41496e2f5dc070ecd4a5d2ef846594d9c4f43b3

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