Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf08b74d54352eb…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 16:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c25a6fdde6c57a4048087f39234bd694 SHA-1: 7decc916998079639e659cc771c9812ed5be5f8d SHA-256: dcf08b74d54352eb7e92c5096dfcae989a6feb8288122c9d23388034f135e5fc
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, directing users to multiple compromised websites, some hosted on WordPress upload storage. The presence of numerous URLs, many pointing to potentially compromised domains, strongly suggests a phishing or malware distribution campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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://studiodugnani.it/userfiles/files/varafujaluvadidu.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8fa7e6e8724680fb46dd84078985b2bd/20581117957.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/91850168887.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/19444e338560297914660ef8403d8eb8/4788630871.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/6620820114.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/b9kln9jebgnigept33h6sarkjr/24635136097.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/716470618bcf719823b5d3ffa6ceb91c/xiwixumebabid.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5cc154e8---96612584927.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/utc1rb3fra808ivn39evb4i569/vomikadedowegak.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/zajutuvibebubovekusa.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/duzizit.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/23614001546.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608645e0882ae---60648898665.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ef65f03652cc97e4ab36c09030f08fab/90387536270.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2ar6dm8tvliv0in8eaoepve5sn/wiboxekaxoruf.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/sagepasatosixufida.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/xipifukefejawopo.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/6365870350.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4438987f2---jakojasemozolovenixik.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/nejuzutotezo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/44834666897.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd51bb8e943---nomeninotuvomedoz.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/vodaxagebenopivika.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/90829795596.pdfIn PDF document text
    • https://preciseenergygroup.com/media/jigizi.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/nodavavotozomolosanik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=3+r%27s+of+waste+management+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/17179845662.pdfIn 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_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 10896 bytes
SHA-256: d756bf40ad1fab02222d1626e36716207c474e775f98bfabe9f7fb17c501fe1e
font_02_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 17548 bytes
SHA-256: 39156dc9e6c468c205a1b64fd976cb3bff112b6acd7ff8052948e754631ecb94

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