Malicious PDF — malware analysis report

Static analysis result for SHA-256 70390d37caff766d…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 22:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 02bc12f8d047847b609a02ebed441270 SHA-1: d55239f58ea7620499ae11ca12dc8dfd225994e4 SHA-256: 70390d37caff766db8aad3fafd41b44dbd898574715d78f04bc87d0d97a84f6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the PDF's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/54945594521.pdf In PDF document text
    • https://4of100churchstreet.com/assets/media/files/biriwu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5b5e288e8a8a142a52e8ff163b4a4798/pufelebelexiraworel.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/44484949347.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t1uehhc84fvkj8nsfeibor9g14/kefuduvivivevu.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/90145201201.pdfIn PDF document text
    • http://panteres.com/files/files/pedofonodubabaki.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ad6ad6e1---40188426734.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/66888043007.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/netebeminopemepapipomi.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/jemisufijesuruvep.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613385f8b4837---jadaxozabenom.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vopokasiliwetewupol.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kusafididopekadugetoluwu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4ru2nj36uk8toul3mvj6nkg44i/98998289730.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/vupimexidodefivimor.pdfIn PDF document text
    • http://simoncaulkin.com/images/94238418052.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fb2b8e7b---winepowufenumulemu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/kokizopawepupuvuliwoz.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/mobimokixavefale.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/30966094138.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/zumubovafonaduwejixam.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/mowuvixutomolegasozepomu.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/96877204178.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/zegozojutulerafasivamew.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/349892946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=thoptv+apk+38.0+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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 10772 bytes
SHA-256: c21fcb454ebd76c7991103efbbafd20e3614256342696cd18d8ba3490d290979
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 17432 bytes
SHA-256: 3593e3ad45001a7f7c41ffc55aaecd5485d9e5f4b0da25759b4d82544ed380ba

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