Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47c65db21cbde2c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 12:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d29d1714c78520d385b58f5b7e5746d8 SHA-1: 12e5146f4a28ff6e45dd0b9b1596c3458872c549 SHA-256: c47c65db21cbde2c405f77e8d374a9b44bd262ddb9d78cfebe641d4c94333194
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bright-mineral.com/uploadfile/file/2021091105004890.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd3c98f21---96714768182.pdfIn PDF document text
    • https://fond.ru/userfiles/file/wapetajogiwe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xifemuge.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/86333413439.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/79138213214.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9f9d5667---50849683555.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/gudufuwineteka.pdfIn PDF document text
    • http://vinmexindia.com/uploads/danifewuwi.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50270332155.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06fe0aa00---1684094412.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u3vm9109ff3fq0tehpfvoclo46/zupututexeb.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7138aa26ddf79387a7db845b3c872c5a/18862891186.pdfIn PDF document text
    • https://nls.vn/upload/files/10360588314.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/89766156133.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/12701383863.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903140321.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/tatisulapolidafefaj.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ek2k0ichlc24r4j3uer40qdto6/mufivuxixowumi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/08b3d1e34f07dde4f0178fab3c00f01e/7067445723.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/44935552615.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/18199243759.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2996cab6---jifejipo.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/dawolowadirerufibumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=debian+android+studioPDF 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_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 17892 bytes
SHA-256: e1befbd1a2c6469c8d65b2b4ab38b49af667f07c032dbac91a88dae6cf58ee44
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 10436 bytes
SHA-256: c1339d713071ab96799b6c1055132181374f94b993caf37ef40e8338457ec3e8

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