Malicious PDF — malware analysis report

Static analysis result for SHA-256 794172baf6202ce7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 00:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b1931312247fceaa27574af35372349 SHA-1: a73850e835e632a9b138426842c68d7acbe7685b SHA-256: 794172baf6202ce7757e5c11fd77b5f38a6bfe2c3654a2d3bf4943055d4fe960
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=ftp+manager+pro PDF link annotation
    • https://bangprice.com/bangprice.com/beta/cms_image/file/xofegajixemitajarosa.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/77316390814.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/winuguvutomemuzog.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/36991038662.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/33724790394.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/88232478166.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/46111185322.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/jopavexa.pdfIn PDF document text
    • http://ilkemymm.com/image/files/savaparomope.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/petuwogexekudakedulifufu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/70553519095.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41776442544.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/xajotavutapugofivujosabo.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/18369894053.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/midimidepo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/48412266335.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/fajaliripozumawoxewip.pdfIn PDF document text
    • http://fkhd.cz/data/img/7704403310.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/rasirodejejagulurirof.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fe60646fce53954436fa3bd2de3eb906/kilidiwuwanodufapawefunu.pdfIn PDF document text
    • http://gardatrans.com/content/Files/wigagoxa.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/36071210508.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/22807670458.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/89e0935b53dcc0d685d8dd17af93e9ff/93961814255.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/xobat.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xonelixuxulezuzubowamag.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_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 10268 bytes
SHA-256: 3236847cae311d5f672154b39a776ec9567dd4bbde07d694310790cd58d89f9b
font_01_sfnt_off0000cf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5B 18116 bytes
SHA-256: 11faa2b78ee0183200a947e39e22a6d803ecc3c9da401e659b4046254cec6604
font_02_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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