Malicious PDF — malware analysis report

Static analysis result for SHA-256 5505485683747ed0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 05:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff832014380a9027146350f5bf6b0152 SHA-1: 99101f403e68169a93a9a51697aa6584149be645 SHA-256: 5505485683747ed06e30fcee38332fc9dfab24dc5ee9fe281ebea6873714521c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to PDFs hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://eurogeographyjournal.eu/admin/fckfiles/file/gebanorovuvoretuxefu.pdf In PDF document text
    • http://czernavendeghaz.hu/admin1/file/xewexado.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/42416b7242e717dff968be7c4fd9ebb0/mefuwik.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/50525681478.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/1faf3f5c633bc70c8601c3952d4a8c5c/jenajunobaduzitenepifoza.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724f78ebffd---rukoroxogofulezopojapor.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/80662680516.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hednum0qlsovoi1k30ng4dhao3/90423917690.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02666ad833---93365081463.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/ravudufupatalogawasutobuk.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/28333510120.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/24747343344.pdfIn PDF document text
    • http://www.db-ynox.fr/ckfinder/userfiles/files/33997194047.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436aa9902d---37530392476.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lakitolodibi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b3761f44a25f98b54269dafc45e63ed/tixojejanamalarubipifuza.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21fb7cce3c---12683205620.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/39940199379.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/04c304a357616fa6e73d1f6c474431c5/69164073313.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77235281d---tuganavujamigumojuxini.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106eafeb514c---visedupubewiwijubepojegus.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m04mhqifp78fvdou8a1vdq36e7/sedumekafabawubawinelovi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/63544929217.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210508193520_1057934820.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/80137999793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=arctic+animals+preschool+worksheetsPDF 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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10800 bytes
SHA-256: bc714ae10a9e07fb2c329425e440e45562e82f494f8438e8f450ffba8018536e
font_01_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 18124 bytes
SHA-256: aa4f1f4fa2866fe598ea8c3c868cd431111032000f629128cdd15fcc51ef6a49
font_02_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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