Malicious PDF — malware analysis report

Static analysis result for SHA-256 111b242d0dcc27dd…

MALICIOUS

PDF

85.7 KB Created: 2021-07-24 11:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 145f1db2b53fc07e0ca8854a08a22cd4 SHA-1: 382bc0352b59f1f648ac793dfef9750c077e1f36 SHA-256: 111b242d0dcc27dd78126fdb2cc3da5f7d3c0b3c8f15d5ef7beb332213693308
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics indicates a clear intent to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad1e8373---melonorulag.pdf In PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/sovorenumazovefigemuvedik.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/nb918sjd6t53gvnjiu7mu8tm0s/10503330651.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/5gsf6n4se1irkaricqrihb34j6/38248094191.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/025vbbitc9p4plruc8fpgp8q31/85441760382.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d7f849cc---nepijusumakowadinuwefo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/94851801052.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/dunagavejevebedidexuso.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504060534518253775.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca6805064954cbc7b75df05a271bf3f0/fenukaloputojonepipa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ef11b66f88ebbfbf0153f208d04ac3ca/sagozi.pdfIn PDF document text
    • http://indemo.pl/Image/files/54286890279.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e818dce7fc9---69047234772.pdfIn PDF document text
    • https://parfumzone.ro/files/file/30927877215.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/77212661756.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/29184224882.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qg4jj6lctnpckdflmsen7sf8r6/kokitorepozek.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/92604713336.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/86472384251.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vefefogimu.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/xudopitaripodo.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/50346603722.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/vroepr7bquqfregh8i1rpvh9dt/jafasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=d%C3%BCnyan%C4%B1n+en+komik+k%C3%BCrt%C3%A7e+videolar%C4%B1+indirPDF 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_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 19064 bytes
SHA-256: 209d69a14952ac30212226f05d114fba5bf17e8551f1da8955ab42b660e27fbb
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 10948 bytes
SHA-256: 64e0f9ccef4083e59547b1907fe2f68868c85ce9e078f34c51a6c24ea75fece4
font_03_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27

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