Malicious PDF — malware analysis report

Static analysis result for SHA-256 3052874cb523c4db…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 07:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0cef4cd9700af094d442924ee2ad585e SHA-1: 78471bba54d6ef26ea21ed536c8b97e4630e7322 SHA-256: 3052874cb523c4db0256d4499a7f049f38fa51c648f888c6a9886f42a103930f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of external URIs and link farm heuristics suggests an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=beauty+and+the+beast+medley+piano+sheet+music+pdf PDF link annotation
    • http://sosonomo.com/ckfinder/userfiles/files/48877496333.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/25992486259.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16083b539e6c0e---50479509679.pdfIn PDF document text
    • http://abnicum.com/files/file/29554685565.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bi3sbeh72jdfn63tcd6g223c82/40999156705.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/zupezelexozizusax.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/4789988046.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibolabumonexum.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb79500107---61519948191.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/68727847062.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054fc5882f---23724597520.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/bajakuf.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/nifodulewus.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/73689835770.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/fedawujokuvid.pdfIn PDF document text
    • https://pellevah.com/upload/files/63474081937.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gatugijavulufobedotovadi.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/67663018358.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe53286fa---jomovemabewupififu.pdfIn PDF document text
    • http://afro-safari.com/upload/files/jolitivejeluxizipebulo.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/30107336283.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6qqr863rb6sdn9b3hu4254vbu2/raluzekejotigo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/fanipot.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13263c1636---80506124340.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac610c79da6---pufogomewi.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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 17252 bytes
SHA-256: a717e9646f076f22f061a10158db3110cc68a0f5c5c2f19ac866d090290c9602
font_02_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 11192 bytes
SHA-256: dd4a6ef78127a65a09e930255e161f4ed54985dfd040df818cee870499da7948

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