Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fa598ed1722a86…

MALICIOUS

PDF

90.5 KB Created: 2021-07-24 00:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 816b3a8ebe0e318fdabbe2171db7bade SHA-1: 530f92827d28ecd977f6537d9291b02e56da3927 SHA-256: 73fa598ed1722a864e1d7a173519dfdd045f5ed0d09792833de54b6a8cf482b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b8071a5f1d4326aac4c826315d89fc09/86581476419.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/wetulivewu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/63557163183.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/muwisejimexedel.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/snkunmsv4mjocsehobpo91fns0/xatesemelodefutir.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6b6af215---89115126265.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8ad0bfa41---sepozika.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/joxed.pdfIn PDF document text
    • https://songhong.info/userfiles/file/rutusewogagaderivixomab.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aa8f2355---pelugimofasuvizixusozela.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fed9f0c251---jefavubezukivezuwijul.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607958588da9e---vozixibowukotim.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/751396d7336b8c45cb72764d484733a2/pekobovofonapeta.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd267bc931---velidepezinidowadonej.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/2ad2ad8ca981d1b537c94a3085536ac2/fepavegagewobotev.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b4b7bedd12796e10a3a5c6b1707bd0de/kigazis.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088324032390---93757454173.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/fabexolixejego.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f663510f---jufuritaro.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/45uodvjiggk289bnrkeenodk8j/57327683267.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/21481520025.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/dumenegutazamajab.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077636f6d1b7---10087773223.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jitesupaxik.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160759a16d0a02---28704976047.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/250db2ac221e2343505773a9f4fa212c/jewugevejiredumibijazijib.pdfIn PDF document text
    • http://tetedebois.it/admin/file/tiwuwerimalepinipesusig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=crear+trigger+en+mysql+workbenchPDF 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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 19992 bytes
SHA-256: 0f6f2923067c5e2e357a5a6f9cef38eac03c6d6e464f38aceee513939961e599
font_01_sfnt_off00012820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12820 11284 bytes
SHA-256: a20e035c429ecce7ac1196778ac6de4116cb226874032862ad9e740275d7341f
font_02_sfnt_off0001423a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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