Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ec582b5a6fc7f1…

MALICIOUS

PDF

99.2 KB Created: 2021-07-07 08:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1d0ebea79ce2922e314a9bb456ededd SHA-1: d2b7782880ca4ac9442419bc1b4507b97b3414a7 SHA-256: 18ec582b5a6fc7f1752771362bfa2e62a7feb3ac30334e9f00689fd51c6cafe8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content or exploit SEO vulnerabilities. No scripts were extracted, but the presence of a link farm strongly suggests a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/6502d51de531bd25ce5467aa396bfe36/4702665126.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b61da8c4d---tifoponimitemaxozimifu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa8372391---vopijijukujume.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a99715308ab---gowamezuzuzoxinig.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/99984057709.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/4883079257.pdfIn PDF document text
    • https://fallsplat.se/file/22969632307.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ns9isahcsfmk6hns42u3ob56jr/perevagipijulujezu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7vt7gce5pr3i08bgr8kdue0qbv/23739803831.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/25142ec523616ff9c62527cb43fa091c/losik.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f967336e9f---65631126966.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/41014646589.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e8de52eb9aa33b1be0d126fdb700bb0b/52309411923.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/2829566571.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/zenabe.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/dopasemisuvojemakoba.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/v7074hteko0hbcvl51dqm9r6d9/ligadadikefemelani.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tikopik.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/58189062450.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d0639830---10570507463.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47d895318---xefajumibev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+formula+of+sulphur+moleculePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10732 bytes
SHA-256: 5df3cdbab15611398dcba0aecd8599717732b11c08aa632a325396082092e611
font_02_sfnt_off00014f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F53 18096 bytes
SHA-256: df282b638ae741dae0bc14e18dc3e75d4f98b57230dce14aae6e02974327c0ab

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