Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaefb55a0992d4a…

MALICIOUS

PDF

70.9 KB Created: 2021-10-03 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8e902929910f7cab3534c5a34a4f7d5 SHA-1: 4b73d1557459bbc020a2ce3669a1bc27fb20841a SHA-256: caaefb55a0992d4ad833999a71464c9c517fbdcfed3a4c6d7c51942707c1782b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit vulnerabilities or lead to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=meaning+of+proverbs+3 PDF link annotation
    • https://airshow-bg.com/file/binagilulomuxireneta.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/mezezumekuxu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec0c79318---tegepobimatetitod.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/bijedefezuburilum.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/56447104643.pdfIn PDF document text
    • http://spakimthi.com/upload/files/85939265579.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0399269b2484e69ea020351132014e75/59323074749.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/89137202462.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631013623.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/kidunat.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614129ffd9868---19309207870.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432f293a6c6---dejunoludo.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lovozurag.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/tunavovewewejone.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/78614676726.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/16226677864.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/5589955584.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/84960243718.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/34529179261.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/sisunava.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/71811131256.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/palogefelavugetetonuf.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/52561721399.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/54370188286.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090120303744.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/20516613780.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/mesaza.pdfIn PDF document text
    • 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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 10760 bytes
SHA-256: 0b35ed54e1307d10cd281551e2219c0b85060e208ce7a2bbf3e2f991423cd866
font_01_sfnt_off0000ccf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 16760 bytes
SHA-256: ca4644615a49e745ce809a142f2e6fe9bb71185eb08424ec91717f2a4f86cb8b

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