Malicious PDF — malware analysis report

Static analysis result for SHA-256 1490f951aa13c4f0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-30 11:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c622f07d4e4d8e7154a35e8a44c3b5b3 SHA-1: 31bd998df065a3b7b17be08436d0e8163ad8ce29 SHA-256: 1490f951aa13c4f0533c926fc5b3bf9be801e4cc65e245bd9b101472c7079ad5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'payload android meterpreter reverse_tcp' in its query parameters strongly indicates an intent to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://e-motorcycle.tw/upload/emotorcycle/files/40874221308.pdf In PDF document text
    • http://star-transform-moscow.ru/uimg/files/penanufufopusasufiko.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6009ad7ad---84766798456.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///zinafabekutipabaro.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/88241099440.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/20610042103.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16150448c6c48b---31227334568.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/depumipibi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/womobo.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/87063491105.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tovoka.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/bc7a2e69d3276b7309eb0f24cea6bfc0/6026284870.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210922_042403.pdfIn PDF document text
    • https://beautydent.hu/editor_up/zimazaxuxegix.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ruxalobuzusunefegu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/busawekemiralavogevena.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/44330194263.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/24015899788.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wajolisuvirejomono.pdfIn PDF document text
    • http://trivio.it/userfiles/files/48761991398.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxamowox.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/37463191118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=payload+android+meterpreter+reverse_tcpPDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 10888 bytes
SHA-256: 5df48b009b0a5835cdba4a33ede5734f907a8760fd6c4fe8c7605d5c604053c9
font_01_sfnt_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 19220 bytes
SHA-256: 193e0f698f2430a9a3ee28a8d3d2b54a2a1b24e25e2cdfc32379d40bf4e7269e
font_02_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1