Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca5f0444ac87b61…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 02:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93b018d0f7093a27aedf5b965e2efb4c SHA-1: b39c0801cf060177b0c61e8a721cebcbd5ee1e5c SHA-256: 6ca5f0444ac87b61d34aa6a36281580353091e61ddbbdab0c2bac07c801df5e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to external websites. Heuristics indicate it uses a 'screenshot lure' to trick users into clicking a link, which is a common phishing tactic. The presence of numerous links, some hosted on compromised CMS uploads and disposable domains, further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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 https://coretry.ru/uplcv?utm_term=livestrong+ls5.0u+upright+bike+manual PDF link annotation
    • https://kisikana.hr/UserFiles/files/mereroxifafe.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/5169031615.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbfd51ca08---nusegadexi.pdfIn PDF document text
    • https://wittnebel.dk/file/82761775518.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/95178550823.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/43061338316.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/52640138237.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/32494341019.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/fuvesisamixi.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/36419782405.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fipasomanenadekitalajapex.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b0c64905f682f3dad7c0c1077459813e/vukovudazafir.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xamivegegigubarenuregaze.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/voxevusuxutekasubifutom.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/83324796374.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/iafrq14qk3k6n4j22a617eoooo/94121233371.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/90212868389.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/wikavojenemiwupubukukorus.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c289a215678---xagofi.pdfIn PDF document text
    • http://learningkey.org/userfiles/pijojumamiz.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/5a1300586f03430d96149792ae03e202/xinifagevifitapobutijot.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c0f4f8b56dd7db7580eccae33886a35e/62957654759.pdfIn PDF document text
    • http://kleiberit.ru/files/file/wevawodup.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b41d82478bedf421f597f87ca5139bef/bovirewibetadizivemofo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dea907818627ab2a9cfd4e7b70f895ae/53941354471.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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 11376 bytes
SHA-256: a5edafa5103098f02f5bd65e252b7840c7fa6719ecc4dfa98c3749dc6da03059
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 14508 bytes
SHA-256: 7264f5276f75b86a54927c5394863d98b9fda7e5f7e6db739c940d5f5c320e84
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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