Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae34dabaa1fbaf22…

MALICIOUS

PDF

89.4 KB Created: 2021-09-23 18:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 557a52c570d59bccf776736b6bcf72dd SHA-1: ed9e2ee26992ddbdd1f69fc8ec08c222a704d80c SHA-256: ae34dabaa1fbaf22d40e179ed69d37e6ee52ee7be1763c2d8e35101aba2442eb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. The embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/91658378742.pdf In PDF document text
    • http://vyveva.eu/UserFiles/File/xumoramanom.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/90265635094.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9e8c751266bc8a9a379579f741166346/18310334775.pdfIn PDF document text
    • https://wineart.online/userfiles/file/57583891993.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/48951827129.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/feriregizeka.pdfIn PDF document text
    • https://thehouseproduction.net/file/84855910001.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/wajitexa.pdfIn PDF document text
    • http://ned.ru/uploads/files/rojivikunuduvixavuvenemog.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/nanuken.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3761c15e---volomidibediduruzagosoxow.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161445315e18da---namesexowidefal.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/guguvofikudore.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/25075513223.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/waxokiso.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqlbigtdm2o1gi5ig3f0oik0uo/88608508249.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ak3ekan0a3mt72sa7ifh8j0h619q8ht2/16732980597.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/sebazuvuvukedajoj.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/30955279883.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba1e25e381---59888215277.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rofifibavabu.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210908035155.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/41864215904.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/barebopifaraxizazaxawiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=locker+codes+for+mt+2k21PDF 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_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 18268 bytes
SHA-256: a09af31d4537ad9e2f23913b4676f5f26c840611b6a82e5eb4f4bfe6e67b55d0
font_01_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 10452 bytes
SHA-256: 43bb461414483c9ca05cea209b6f9f6317e0ed52364905b9ae4c9aee33a615cb