Malicious PDF — malware analysis report

Static analysis result for SHA-256 77acf58d50f51d9b…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 04:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90bf28f2e1a8ad0a23e69034b0dbb610 SHA-1: 89809d0d982286d06c416e17d29df9ab54c36864 SHA-256: 77acf58d50f51d9b4b3ee559387e426b814900c033ba3db4c927f0e8dec7b226
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a fake CAPTCHA or human verification prompt, a common lure to trick users into executing further malicious content. The document also hosts numerous links to other PDF files on various domains, suggesting a link farm used for distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160778977770bd---82699903844.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9801c98fc2---97596162387.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/getuxiruxesazudulubun.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xemataberifedabadasafi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2ce34281---bapasajotimumuzujo.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/42449390715.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/07f95052af4a4dddb07a5b4653ae6d2f/jinutetimokumulam.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/lokivizurafusagipep.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df23ad2b66---tifanevedukipuvu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc0f40d00---lifedibozulorulodepog.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/05b381f083041ca8a00cfb0e9871f29e/75172434415.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dalohv172a3md39aof9n7j4o33/rupodajimew.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122a68382e---59549403676.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lazerasibirorevu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c8931ac8---24284051645.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/082dc2c3864e57018b90d4b2e9064e1a/kasofamusivazekivakexak.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ce82d4c---94703148486.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210620_E39B228B7D510616.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/247fdd5a80c6a0448eae2fc672c01a00/78976287110.pdfIn PDF document text
    • http://cortabellanews.com/userimages/ronovip.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a02fc78224c---44745814544.pdfIn PDF document text
    • http://splogservice.ru/content/file/9863715840.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f3693d7458398f3cc6ad79588c04ea78/donunogukesunefelomu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c76961d63e579ab6a196b62f89793e0c/43011406015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+punch+man+sea+kingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 2928 bytes
SHA-256: 8e8533ce9d031507dbec05e3ca755bf8f82e5504b8cc43eef3c4b3a858ba7597
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 17876 bytes
SHA-256: 42690f135e221cac29d2dee7af7039e78deada0e311b78addb7b4f247ce5c584
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 10672 bytes
SHA-256: 23590fb129e6cd30fedf70139f9d3edd24ea3dcf3195119a5fb2d14d3d71cd58
font_03_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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