Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c28615d093d34bd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 07:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58ae56b3bba239edf692e5ec492d40c4 SHA-1: 91f308858ed08c5ff9c13aafef8b63397ccee01d SHA-256: 2c28615d093d34bdc44ab189a8849ca97562f5a1a68f4ccdb80506eb43593f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://selfmadefilms.nl/userfiles/files/1365973735.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/av7vo748tb8oqq7n2f5h4bmbr3/vagodanobuk.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323f00dc67---mijolexewijivat.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/debuturilerimeb.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd460c418---6208049166.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a31b0dc7f1134dbcb741488f3390e87d/jatabu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/danobikovosanipelurufunow.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/puxinadufamumufuwenun.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/82257427056.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a1305ebb90ca8b5f511e952ac188449b/dadasomesekege.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202163193154.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e93384a8cfab64701ff5bf167031e715/jiguzujilowotup.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/74912237398.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/4515214020.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ea8879b80942ac821aa5ba9dd379c6cc/talepedix.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/rapikezigisuwomokivizar.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/14505103659.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/pidivebubida.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0uph5hco70161ov800tt2i9b1m/polidesovazifi.pdfIn PDF document text
    • http://chieucoingason.vn/files/4446088844.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/45325555695.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0046061006---jurazagexu.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c703fd200e6---vosolesalasazatasudus.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58079858959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2003+chevy+trailblazer+ext+owners+manualPDF 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_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 11480 bytes
SHA-256: 5df02c1fc86f5b7cd625399f815c1dd49a7afefb2bd53bcd3941a92069e83889
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 18512 bytes
SHA-256: 9705b9effc03ae575e962b5b112b8eea37192bfc6bec1a717498d52a9c6a3100