Malicious PDF — malware analysis report

Static analysis result for SHA-256 204270d163332cc4…

MALICIOUS

PDF

84.4 KB Created: 2021-07-22 14:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8205ae11d081e9d14d0d74d4b46cb6e SHA-1: e026b3c49d6655042b5a2a988ce09584601b8bf7 SHA-256: 204270d163332cc49669748950802903fdcb4cf5a9dc815060285bf5d8ffdd5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, many of which are hosted on potentially compromised CMS upload directories or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://auldskoolrocks.com/clients/878384/File/75018965219.pdf
    • http://gachbinhduong.com/upload/file/46135602294.pdf
    • http://actlogistic.vn/upload/editor/files/juzopup.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/begofejanal.pdf
    • https://salvatoredivilio.it/userfiles/file/demor.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vq14q17lg6kjijk032g7ggukhc/98064861665.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f339c559752370df942039dec54ab5a3/88442154039.pdf
    • http://angelescare.com/userfiles/file/muxadizebo.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6dc87000---kuligujowataralozaremebo.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/kfkee5s5rpl3t6dgn1k2g3af4k/dogelovazan.pdf
    • http://zabradli-znerezu.cz/userfiles/file/61874216571.pdf
    • http://sl-light.ru/design/img/upload/file/76966771119.pdf
    • https://tonwen.org/userfiles/file/24187419712.pdf
    • http://abwgulfport.com/uploads/files/28438497515.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ua7hqfju06b6eu92gb434lshu1/7519793506.pdf
    • http://dailycan.com/userfiles/files/banemapimadosunup.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3248c57952a01fd32117aaa63d919ea0/degumog.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c8df2f89---49228274641.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608469e629ea9---faxekozatiw.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/jovirivonajamo.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/9413740607.pdf
    • http://probeg2000.ru/files/userfiles/files/debeta.pdf
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/12883518035.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a03819ab1b---88026269099.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=img+without+src
    • 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_off0000e6ea.bin
5a94ba3380acc48114980dc37d15acd8add59d0ebcf0259375bb5553c98798b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 17212 bytes
font_01_sfnt_off0001144a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 16792 bytes
font_02_sfnt_off00012c61.bin
b484971ed9886502311f85ffff74786e754e6772324f8074f2bd07c79b103e94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 10372 bytes