Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b4c3710a273783…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 06:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c98950eb8da5e1ed45ba8a4ce79a379e SHA-1: f2d945630edb215aa210fc516e7e81c24d041cbd SHA-256: 04b4c3710a273783eff56f295980484a5ab3b4795200fbbeb1628c383374cd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=convert+ppt+into+pdf+online+free
    • https://advantagelic.com/singhania/downloads/file/xotekafasakemek.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073634315430---37585029343.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be412737fd8---ferosimagudenaniwugi.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4d450c71129dc060c774c64c72c0c14e/zifimofumiteruguziwuwe.pdf
    • http://studiobaliva.eu/userfiles/files/4210367418.pdf
    • https://chmelo.hu/sites/default/files/file/tewabewalubefowixokamuda.pdf
    • http://personnelstrategies.net/userfiles/file/91296885075.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607470a0b4188---jufiwanegukerasovinapo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9471f43846---bovavunit.pdf
    • http://imaginove.eu/data/Files/miziwizuniweso.pdf
    • http://tuzvedo.hu/elemek/file/gogopipiri.pdf
    • http://aloeverajuice.cz/files/file/xurawebidesa.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad33ac5b---zajobedeguxisibabimulixop.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/xemaneda.pdf
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/98006169645.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9848d3bcbc6d4377beb2c453c5fe8985/69266018808.pdf
    • http://mikailang.net/userfiles/file/20210501201538_958063674.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/49039541125.pdf
    • http://vce34.ru/attachments/file/32534111378.pdf
    • http://www.heksan.com.pl/file/79843458587.pdf
    • http://mg001.cn/upload_fck/file/2021-5-23/20210523091003168797.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/digujibipugokizawa.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/srobrdtiacnb16l4nf9ajlt2c3/xabodudugikeva.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5042a4b42fad8accf74f9aa8904d1acb/53652296099.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/7bbba241beeb4a50d807df3acd0bfad8/dowaxezerenilafenoxazap.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/58940085891.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_off0000fd86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 16792 bytes
font_01_sfnt_off00011598.bin
1401940f9de6686ba38ea79e8c29c76012debca454d85cd599f4c83fd65a27ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 17348 bytes
font_02_sfnt_off000142e7.bin
d6ddc096dd05658acb42bdc0b8ff2e59d390e180014717a36e7aa43f166e4dfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x142E7 10260 bytes