Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfc67b20fb2c757…

MALICIOUS

PDF

75.9 KB Created: 2021-09-10 18:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45210fa1ea0ca31ad4fea30905ef706e SHA-1: 38e435db840385128f97d8b8ac4baa892f5ff66f SHA-256: 9cfc67b20fb2c757c859fcd6a037274971074d107a03d1387853af43bf2b425b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136031294663---97684254751.pdf In PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/62738295645.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/56320857069.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/nunuludo.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/wasaguzevofugetakazotasuv.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/liwivib.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109051247401274.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/vajawikafulu.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/91570003090.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/64790865282.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/82868067984.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/de592b343633dc27e93c62972c1ed555/95569537747.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/5478161148.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/budidijovosinosevutul.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/21109342031.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/53156881985.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c8b12a33---nidizuperi.pdfIn PDF document text
    • http://zae.me/datafiles/file/1274940043.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/12837112260.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/57908764590.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161325699be35e---17436482154.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/woxexofirujivisami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=font+manager+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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 18832 bytes
SHA-256: 32633421d27ace70b8428082cd370c208856fa7762cf2ce4a530f5828619f433
font_02_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 10356 bytes
SHA-256: e22dfcd3d1a283394687cb088d8fd6718a5214107d2e9dfbae4f1c6737f8abd3

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