Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b515165274a0ae…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 06:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8557bcd1da8d14f25cf3146091847f8f SHA-1: d8cba9b2e1e562a9969229d4daf7e3b25a9bccd9 SHA-256: 78b515165274a0aee0ba85261989cd5bfef8c42f466a44183128f9d40bba687b
156 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 an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=appointment+letter+for+school+teacher+pdf PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d0f8ec955c0ac5b63bb677f51b64fb63/bodil.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094da7b2001d---dopuvadajizifite.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/likamagitotatiwegawebovog.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d28bdcf16b0b7dcbd55903484f2ed693/nulapekemivozulelelijos.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dac3b3c5f16---61199967295.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7067f99f66---34668899662.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/01hg3vitqn12i6stoksp2egcmg/32821280596.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/69851512421.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/saxofi.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/13757239035.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/58aed605f37e48dec783776f47714869/regolofefawufelalateseg.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2542b2f7---fejidajojetumepikibipuwus.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/d6a1046a2ed4ff72258a9f77419c8516/89196755612.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/duwof.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56cb3681b---11212343829.pdfIn PDF document text
    • http://growourworld.com/clients/83159/File/22782284833.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cca0a2dc4---8003577403.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/vakiw.pdfIn PDF document text
    • http://jucal.es/images/file/fopimilazagugelezo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1233bba0b2248e33e7d5fd5d021a00fd/78207377739.pdfIn PDF document text
    • https://braus.uz/images/shared/file/30052457791.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b432641a8---10505539163.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/67124357858.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/87840731503.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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10868 bytes
SHA-256: 5fcb0e314a4944c33cd344e5469ee13a0f448e24580aec8ae1b6205d05845a46
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 18188 bytes
SHA-256: c089d6496972c65ca5cff6931379132441ab3ad5958170e68a38b9367bcac65b

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