Malicious PDF — malware analysis report

Static analysis result for SHA-256 8323aebbd90bb78c…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 09:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86ed391b2bc1fea6ff4edf77cb5f80c4 SHA-1: 4ed2f428b91336817913942b9e9d3adb045652bb SHA-256: 8323aebbd90bb78c92c4fffdd3faea0d013e233a15a638565b1d3b5d2a4ba7e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links pointing to external PDFs hosted on compromised or disposable domains, a common tactic for distributing malware or conducting phishing. The presence of a link farm on disposable hosting and compromised CMS uploads further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jjkxmy.com/upload/files/202106230944081690.pdf In PDF document text
    • https://hse.tw/upload/file/gizoxadelokox.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lvuntiu12291i9p7i139fbtp60/vujuwexefiw.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/pugubinujonejamalo.pdfIn PDF document text
    • https://andana.us/files/files/48039915670.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/legagesurodowusijogiw.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/jurilemodezatofefizukubib.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7504ef04200aaf41cc03906faad9bcc0/74634147038.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/xonolojutogu.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/59651830665.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/76568011294.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/pugulozaradi.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/bazuwiranoro.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/wiwubiratitupoladobazar.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/61048307952.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tanapakozimetuwixiz.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/86972429551.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/9875143487.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r6i6oh0520tc737hros6692sf/72393174083.pdfIn PDF document text
    • https://peterdegendt.be/file/kezorodezativixuxinid.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/48095287982.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/48485706976.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20897e79f---nijofopepevo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110459a933e3---41442776439.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/70366128613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1+radian+is+equal+toPDF 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_off0000b941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB941 15980 bytes
SHA-256: 7ac21b1f2fdc8e11ee94d50c591505b910ddf3e5e720649ccf1941882fce6481
font_01_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10440 bytes
SHA-256: 97f99277d10ec834c9b335222a1bb673d8c222db158a1cd98c8bf8d9554a8a0b
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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