Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60c5c6a8d0d5637…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 03:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07e146aeeec286248aed72aea2a2a78d SHA-1: 1152b9f9abea6ced60a8400611971d3e68a72e82 SHA-256: c60c5c6a8d0d5637bd3e67f1ac993cef15e48678ab90bc1271f8ebe0fc2457f5
196 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of 'cmd.com' in the document text, alongside multiple URLs, indicates a potential attempt to execute commands or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1pqdii0r6tkrtq9vcj1lpchd78/revalefaperadolusukawigiw.pdf In PDF document text
    • http://qdcmd.com/data/files/74163383940.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/59751957436.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/5181395637.pdfIn macro / runtime command snippet
    • https://liniagdanskzydowo.pl/files/50132559113.pdfIn macro / runtime command snippet
    • http://erictex.com/ufiles/files/ripiturabebopunazekete.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/luxitufikewokoxelod.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/laditagevotuvapiwono.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/sedutibazejijasarubam.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/32080699082.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/mulubosodibapadinobaxebat.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7004rk80tr8k6mak5qknr2h4d7/kemuduxew.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507002012857475.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/voredowitobe.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tokebipuw.pdfIn PDF document text
    • https://milkyway-vn.com/upload/files/40914632597.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/jakinoladave.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210727183304.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/52366846119.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nawifarurusunezadubif.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/levejuwusanoj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9dbdcd13b---rofagedevadewenoduzuj.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/56746080197.pdfIn PDF document text
    • http://stadion-zarya.ru/cIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=managerial+accounting+garrison+11th+edition+solutions+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_off0000c1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FA 10960 bytes
SHA-256: 788c4e1fa950b9656c74708f23d1672e78d2177b48d578e69a21db8c51aa8f1a
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16164 bytes
SHA-256: 7ddef9237ad3c8d28c7213b5037b79ea995e5f86502c98b0d5c5c8b04f1314db

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