Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c5ef8999a97c0e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 15:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7344750fc822d29656730dad3052389a SHA-1: ee4f4434e45e77b2d89f34eb0500d23b61bd6da8 SHA-256: e0c5ef8999a97c0e15df7fbf7ba5ee637a85c46c21586446cb6b1d193d03e00d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external PDF files, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. Crucially, the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security measures and execute malicious commands, likely leading to the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://exam11.menapoint.com/app/webroot/upload/files/rajilupe.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/57249842763.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/17247052566.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/13862636612.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc29626baf---sezigegonarug.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161333aec512db---mawigevawe.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8a57ad26---virogosinelire.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/tizeralanutesanufale.pdfIn PDF document text
    • http://erictex.com/ufiles/files/10718218840.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/69047519546.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xabuposakorax.pdfIn PDF document text
    • https://onlinendttraining.net/files/80566606215.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0c999fb84d956b18de152afe4909f930/xelepivodanikiru.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/70994747429.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/53849086352.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/22443409769.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/tapafamepirexopifoberuman.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pigubimufetamifak.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/46339461680.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/428882b5f952f24a9901d3ee347af7a0/bajexusadusomugemesige.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/97754493575.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/26965241380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+development+101PDF 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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 18844 bytes
SHA-256: 03b1b0171254e092214b1436320856f959ab47ae1ae91585a56313ef4c3469b1
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10444 bytes
SHA-256: 01af173b7693b42ac1e0eefe3e1962a18d3fc621600185a5a95168050745e618
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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