Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b10cc46b1f5fe10…

MALICIOUS

PDF

83.4 KB Created: 2021-08-27 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b64962a820d4534c4b39fff48eda4605 SHA-1: 94cdb8a5fd076e8303ed98b31ab98b8e969e0006 SHA-256: 7b10cc46b1f5fe1086b249a43fcbb5b6507831b2ec89a820d0d28ccaad80c105
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://lokale-uzytkowe.pl/uploades/fckeditorfile/42449390715.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a6c02925---16533234385.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/73029849478.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/razijekap.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146c60c3077---88530065820.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/zebefexevat.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f957d3287---95016331054.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s6gp0gsbct482oqm3ao0d59bd4/53026150587.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/93670060683.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/19449002858.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/32109243980.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/16087199795.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/fapofagafikedorawesi.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/40870783627.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/91561249637.pdfIn PDF document text
    • https://samowar.ch/upload/file/wawaxozagizadopujevij.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/busemakajevevakubedujimig.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/batufesigaxukefapem.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/budoxuzaxak.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6769b1b2---juvamexalivomo.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/takovofusigipirila.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/24011d3ff611bb1feb95c3b51cb60a23/wipasofag.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/71000184350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=video+player+for+android+autoPDF 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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 10508 bytes
SHA-256: 2a8091cdb1d5eb01d396f8684481325f52edfb39db8863356fbd69ecfca32d59
font_02_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 20456 bytes
SHA-256: 8050ad7c818ab90339f01b75954de579d5e8a4c3e1f75c475ffb2685c759b7ca

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