Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaed2f06224208e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 12:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6b895496ff0ce35b99127cee445a824 SHA-1: 684703ea4d0c0d96a058254cadbac2045947a079 SHA-256: caaed2f06224208e9af20849ab127bbf514e3ca891fb6e9e596fb33f631d21ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bluza-shop.ru/content/File/jisufisejiterolotixesiwu.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28843e098---68254503576.pdfIn PDF document text
    • http://ymmicro.com/files/files/julibawigabat.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55972859488.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/41059295180.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144452f2c920---tujulevisepeves.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/95349353280.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/37177651529.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/rijuriwowobejewibepe.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/gapoxijelilib.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bezudofadefuwid.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/67448344601.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/31422959261.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/jamupiwume.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/23792803166.pdfIn PDF document text
    • http://learningkey.org/userfiles/30393481354.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/mobixupa.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/96042966060.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/43d2368fd48abfe50a52c80964e32e8d/mofasazeviwigazefowuk.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/didodij.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/tujewasaxalilabejodiseg.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/gixukabepi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bolabisolefiko.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/59552211773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=truecaller+dark+mod+apkPDF 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_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 10368 bytes
SHA-256: 86ece9a851a37ce4476bcb0273bc612b0b0041b20d66c6b0ed2b34e307d6dfcd
font_02_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 19716 bytes
SHA-256: 7929da661062cab74aa7fdeb00f0bfb6ff5080641a53759a598f643fb59b3b90

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