Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab372b665c2fb95…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 03:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01cfa4468009576b20549368a505c45f SHA-1: a4ddc1ae2b3e562c8978d8c7c67c49b3c7a895a2 SHA-256: aab372b665c2fb951ba750b3749d0a17f15222ffd70357cd7373f7a8ee7a03d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The numerous external URLs, including those hosted on compromised CMS uploads and disposable domains, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://inwebjor.ru/uplcv?utm_term=how+to+take+a+full+backup+of+android+phone PDF link annotation
    • http://vmkmsz.hu/userfiles/file/mebodepejogajinirolevid.pdfIn PDF document text
    • http://offerparts.com/upload/files/20622128864.pdfIn PDF document text
    • http://iscelenie.info/files/file/97818857915.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613019bbb8eff---vusesopogamevexupeni.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a70437f2---lorugerosuku.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/xenipagilotinapajede.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137c313f20e3---92590161481.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/femugabikezisegederogixur.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/48578883608.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/39000582123.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/zedalopojofu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210905104406234721313.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wonikatuv.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/2571233776.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/nubigavakiwonasesav.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/jezevisulukowikunoxaz.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/91606659923.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-01-22-03-17-BHAcuhPQ.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/vumeloxutojoti.pdfIn PDF document text
    • http://15881588.com/ckupload/files/fosedajezikinogixo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5016279---rezeboxaw.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/borivafinisoxuw.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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 17620 bytes
SHA-256: 0706e3d7a96dae6d3b8da3580994bc8bd54944a09e5e47eead9fcbe4d4c01c81
font_02_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 10960 bytes
SHA-256: 834c36a16e979062066626dcb006d27b576b0645b87e290a61d2ea85bbeea9de

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