Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c41e90d203d29d7…

MALICIOUS

PDF

84.9 KB Created: 2021-09-24 02:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d04f7099ba95bd56568e879f17524dc SHA-1: 1664fdc40ef66db60b1f6d24ce22db4801c582d9 SHA-256: 9c41e90d203d29d7be4d972cc12a1c30ef89ad2f9b43426e2bd1c86589dc588b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other domains, likely to facilitate the download of further malicious content. The presence of external URI references and a 'link farm' heuristic strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://medvor.ru/uplcv?utm_term=download+ps4+for+android+apk PDF link annotation
    • http://unixsensor.com/uploads/files/202109051230026179.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/karubademanimalepulupuxan.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/nelawalewazepexabap.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161363ae1aa12b---vozij.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/56922857014.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/ferel.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/zufubinelegumajizedum.pdfIn PDF document text
    • http://krzeptowski.pl/file/xekefikovokawiga.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/50643482866.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614510cf227a2---nojasilulasiruresijeju.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd29626b81---88323910468.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/20399776127.pdfIn PDF document text
    • http://schokofontaenen.de/idata/81396026257.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/78499476986.pdfIn PDF document text
    • http://hidropro.hu/upload/69382943320.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/61191949663.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d5417ff3d---14518065862.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vojabudotapuwavuvureledaj.pdfIn PDF document text
    • http://rrarental.org/upload/file/jizagiredonujakijidom.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137591b831d6---10492974523.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/sudosol.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/xuwitadububel.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/65430948361.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/geguf.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/mezigi.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/xezakarinifi.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10520 bytes
SHA-256: 67680daaf77d20728be90c51fd9ef0871a92d53e8b588d6f88549f3999e1b0cc
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 18092 bytes
SHA-256: 04b73833ab3a7fdc35223fb6af007c14c6057c3f676f5f547d3884da66c09bcb

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