Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6f94c6cc93e839…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 10:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2ffbd73a2b8aff5a497599cd83d058cb SHA-1: 021d81cdc64579f6311999991dce2f1c7d6d44c1 SHA-256: 8e6f94c6cc93e839aaa0d434010939820e5cb1a9ba6488504f6b9f5244291e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as a lure to download further malicious content, as indicated by the ML classifier and ClamAV detection. The presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://kerama.altrodesign.eu/ckfinder/userfiles/files/kapagenojajirig.pdf In PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sajilez.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/38133897740.pdfIn PDF document text
    • http://midel.me/userfiles/file/81192234296.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/bozipakadupo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb93979c81---46526116460.pdfIn PDF document text
    • https://istanajp.com/contents/files/bivelikobototu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/70338336746.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/35951490315.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/92849027617.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/23306328677.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/bilabavafit.pdfIn PDF document text
    • https://airshow-bg.com/file/suberujesolixedupar.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5429460e409cf90390e9fa745dcdd203/29954010012.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lg5k022490j9q7u5i2pcvfir11/godeferimusefojijusuf.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/89195317065.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/rateranegalutededaji.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/lawewexikatofiwobusugoma.pdfIn PDF document text
    • http://contelex.it/userfiles/files/35912858573.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/sejupivigotifuvosu.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/75458464736.pdfIn PDF document text
    • https://uangraja.com/contents/files/45880328586.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902060809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+app+download+2021+new+versionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10968 bytes
SHA-256: 235f2cf85a4b40edf579e1e273b05e25894cbc55307161d86d2e1afcc90f0236
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 17700 bytes
SHA-256: e77f249bbcf021c516aa58a0f3b380918a2db0ca49e0450fada4a59ebcf01d5c

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