Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20e087fc158c444…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 19:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8e8e08875a80efb5ec405d52fd96ae4 SHA-1: ad8f4f41eed33802c0dc45fdfff51672f8bd7855 SHA-256: b20e087fc158c444afd2ef7303facebb2ab573bbb29d878d131188999b6bf1dc
176 Risk Score

Malware Insights

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

The PDF file is identified as a phishing lure due to its image-heavy nature and embedded links pointing to compromised CMS uploads. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot hides a clickable button. The numerous embedded URLs, many hosted on compromised WordPress sites, suggest an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 69 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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0ea26c2f---jozejawabilowolu.pdf In PDF document text
    • https://fetogram.ir/images/upload/files/9987434664.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7ed11cb6b---sewebavowemuwivuka.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/suketubilis.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e59b650d98---24362456140.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/37864442343.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210929_195859.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/89291648802.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/84769301773.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/dumiraxapal.pdfIn PDF document text
    • http://lamay.de/userfiles/file/gikadixune.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/ximijefexen.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/faselupulazijazasalosimup.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/6642105613.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/gurizemuvemoxuta.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/sanagawawu.pdfIn PDF document text
    • http://megalaserasia.com/upload///73680446867.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xinalafibokofid.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/tujorafetufalidefafo.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/mesorobexenitow.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/54421269055.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nadakajepajonaripibozux.pdfIn PDF document text
    • http://tianfonmm.com/d/files/viparuwajimuzafonap.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/kilevefixutedibax.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd48ba6bf---15698754332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what%27s+wrong+with+this+world+mamaPDF 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_off0000b3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 14080 bytes
SHA-256: 39eb22ed0970a895efe07af92c08d529fcd80e7ffd6a42e2326e96cf50a6a3d1
font_01_sfnt_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10676 bytes
SHA-256: 2dceb637e9eb0b7e85a4de972220fc8ec511c2dcaff58238665c5063e91a36ad

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