Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18004cd34679870…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 03:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b248ecbed4aabfc393ca2b48eb2f9e0 SHA-1: e37d5da500912291e816568208903463762647fc SHA-256: d18004cd346798700dd5d0b8b44d04cbcf9a82353782d3e94fd101a7a2f124ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many hosted on compromised or disposable domains, strongly indicates a phishing or malicious redirection campaign. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reklama-v-sochi.com/ckfinder/userfiles/files/76569817637.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h187k3esjreepci18b2hiqdu8c/worakijavobalapevob.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zuwewulo.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/95098945213.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ds5o7pnk7clhjedn80iqj5u56u/3925654212.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xobomizogibudipa.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/taxanomokejopasetotu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/lesapolegawukonuzomiral.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c12b593e2fadbeea2cab066149ad3baa/58312391763.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/22543201276.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/91952312814.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/samigugitazali.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kezimamerivetubav.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/dapalivita.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/v2vjflc83k9b4umt336ddno5s7/bafuregelerikorozafe.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c82ff0f11---59190903564.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zamixeruxosefenomuz.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/69894209244.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///16887961796.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bb28528bdb1---koragenoxulipegipoj.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/matojiremigibomunivofod.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/uipqn165gu6f6j39l0j2b99l7u/61773343261.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2963b4b33---71081553613.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/31487707841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ruckus+zonedirector+1200+configuration+guide+pdfPDF 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 11340 bytes
SHA-256: ec9a1cbd035854eb332d4a9b007d8c57e6ea08771e2c2dd16bf1258dc88eb7cc
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 20032 bytes
SHA-256: 8f12d2cbb05a430280033fbd02a582e45b54b54c5f50c2d807cb5cc6fa980636
font_02_sfnt_off00013697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1