Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb23faccd48ec10a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 09:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 685ca062b7d12d1e3d7ade486660fef5 SHA-1: af85e4ea1a21f5114281cb488da80131ac6b3814 SHA-256: bb23faccd48ec10af336b518b574054c0ece47146e82714fa97b41ef8311a13e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://jmyhship.com/uploadfile/files/tuzarorojefafupawonune.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/sekuz.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/72420554111.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/19523622089.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907210055868475.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/74389114001.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161331e5595991---93685527387.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/xudefixeboxuvupapalikokem.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/78373913000.pdfIn PDF document text
    • http://4bx.pl/public/file/vapovud.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/rixilirafexu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/gofuk.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/9411468612.pdfIn PDF document text
    • http://belv.ru/userfiles/file/93761671496.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/23811056197.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/telesi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b642d8639d---27039184505.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/s666gjne967f5c27hvnrd22q8r/61069771088.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/49661321588.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/pexoxejesexebugose.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911215249.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/13980658055.pdfIn PDF document text
    • http://metallpress.ru/files/36574793578.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ce45f2ffe8ec4f097a5ecd0f121dae62/34685807371.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41036405079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=max+volume+booster+app+downloadPDF 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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 18248 bytes
SHA-256: 91322b994c657f432ded79bddd239a7f36976c0aaffa5af82a536a7b34e782ba
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10948 bytes
SHA-256: daa459ca60b698a8a27750aaf42ba00a52792f125242d9958de25f02ea7c9934
font_02_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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