Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c5b8fa0137de5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 09:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: adecc057be300f6f1c48af3b0db711ff SHA-1: 0a79450dede548f4f2f862e535d8a7e8efbe050d SHA-256: 3e8c5b8fa0137de5db46b8c4f84cd889aa412ea4972179c3cced5d3003b70491
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various potentially compromised or disposable hosting sites, many of which serve PDFs. The SE_CLICKFIX heuristic suggests the document may contain instructions to bypass security measures by tricking the user into executing commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://globalmediaminds.com/uploads/files/82740414439.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/91125727534.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/turupuvurowifotiripekipa.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210822160749.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad016ed5b71---jabumedog.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/76482146173.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80963954646.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/josesiju.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/fatawajali.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210614_11978EB7CA0B4562.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/23614163636.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/23466598640.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210824222142_3rwbvb.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bafc18ab---91475045599.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/rojodal.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jfpt9tkmo220k1q4f2nn074ijc/wujalosezugerukupe.pdfIn PDF document text
    • http://ozari-ua.com/files/file/24754067547.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/boralorimegudubulix.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/70303382042.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/61973430732.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b460cdfcbc9ef38b52e4d08ff9a82abd/vataxokunewavaxu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736d5f6d486---36963534284.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162519283714691647922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=combining+pdf+documents+windowsPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 11012 bytes
SHA-256: 91fea161e73294a1a56e98ba730662e0d697c687e5250de9ed1458764d9b7335
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 17856 bytes
SHA-256: 5d5fe24d15e9292bdd29065260ef5b17b2a8420de98dbf682423cb06c861ee3c

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