Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a4b246296dc2f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 13:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f12f53e87c6fb07c357694e6ebe9b69 SHA-1: cb2bb8b361bfd86345bacc32402a9686279c6adc SHA-256: 081a4b246296dc2f23812b8ec64cfc6be4946dbdf1cc1f341a334e881835128e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e859dd322d828b702d6235163aae21f/74141800882.pdf
    • http://av72-reklama.ru/userfiles/file/1631362647c28169d15cca0cb3bbc7.pdf
    • https://ce-mi.pl/uploads/userfiles/files/selonuzego.pdf
    • http://michellenevinracing.com/FCKeditor/file/pujaroporaj.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/boxujowerofi.pdf
    • http://xszhuhai.com/uploadfiles/files/zogudinezofebiduzije.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4c7qd2p4h9s0gei05p4q1psq40/95133489903.pdf
    • http://alimentosldm.com/userfiles/file/42348644527.pdf
    • http://energo-market.ru/sadm_files/foladuwivop.pdf
    • https://horkolas-gatlas.hu/ufiles/file/521823090.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/guwikedotupigixajidaxezar.pdf
    • http://cn-junsheng.com/upload/file///202196154322.pdf
    • https://ctapigroup3.com/contents/files/kaxabaloxulur.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rpmembkhi5t53poo4d55ra7ig7/demavexefijusasa.pdf
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/76452242946.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92698419677.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161335dfc97d34---wijinelimeso.pdf
    • https://ceylanotel.com/firma/files/zafuxi.pdf
    • https://digireg.nu/upload/26953114819.pdf
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/voralajavutenuperodozobo.pdf
    • http://hcvitamin.com/webroot/img/files/89329771678.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f7656f0f0b94ebf1009f0f75d1f46c8b/tatijemitogamekutudoti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+online+is+free
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/54591104520.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0b0.bin
7b7033e9dfcd58c7289ed5d21c664144def3b006a808b80e2c80ae8764d30d96
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 10244 bytes
font_01_sfnt_off0000c7de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
font_02_sfnt_off0000dff0.bin
7ac72ce6c26e89aafc62d06f96d312a106eadb1355cd97966794be85ab329802
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 14308 bytes