Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f30f9f77701aa6e…

MALICIOUS

PDF

99.4 KB Created: 2021-09-06 07:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51cce3c334de0d6b7196a61a2e06a927 SHA-1: 13671d71c79c22e6026fa64ece7d620c7c9cee97 SHA-256: 4f30f9f77701aa6ebc7fdf8ae4e9daba58a7b8e5a70f75956eca68bb9f5adc05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/29688eda72322c582cff58ffbd58531f/wodukifelivonulumuwisumu.pdf In PDF document text
    • http://hajni.pl/userfiles/file/naxojogawemojaxedem.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kalinevibuwijozesitepe.pdfIn PDF document text
    • http://zubrcup.by/files/files/20842091190.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba82536f47---tugisukoxoraro.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021052914355573499.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gb8q3rh2gf9tklb1luhqqjr4n5/61778399796.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/76284554786.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/gopidonuvenivotere.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/18083601399.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16124ac19bfb1d---49375568669.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f190200143---48692948334.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a320cc25---1819623896.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befaad0bb25---gamalitasepu.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/36649310601.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e06507e453d449ee8dd8d40eb96711d4/jezimata.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/fadaxuborolakego.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc271d36017a6140baf0f75b034b7f5d/sikunoxowa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/70a79464a5f78c1dd229705318af3e5d/gefofuvesine.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/73642426182.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0310096a86aae26b449ea68377d9cc63/pejomiwovojuvaba.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5795c9cdc4---73984907578.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/kolowuvivilemubawitite.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161192b3f4b904---7098259335.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/14798864575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=historia+clinica+dermatologia+pdfPDF 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_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 10956 bytes
SHA-256: 7d63c9d038f68fcbcc157f7c32775ca9f6d1b4ed0e65d057eba196dfc1ac1a15
font_02_sfnt_off00014f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5E 19052 bytes
SHA-256: c6753e5f1c2e0b7a89a466e4329fee49e78f43cb907b264dc0065989fc94ce4c

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