Malicious PDF — malware analysis report

Static analysis result for SHA-256 26356bfb3f46baf7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 435ad62362762620dc79bffa91cf9747 SHA-1: ff77f85e671a0365cfeb93c073f111c955cb745d SHA-256: 26356bfb3f46baf748294d5d5ee37dcd57728d74b6ef33caa1665e7b4afcb1fd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to facilitate the redirection to malicious URLs found in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=get+8+ball+pool+coins PDF link annotation
    • http://hmed.vn/upload/files/danivefiw.pdfIn PDF document text
    • https://southafricapools.com/contents/files/favefikafemomob.pdfIn PDF document text
    • https://hoongnau.com/upload/files/44253174906.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7dv4n2lf4kk9qktki2ii6oarli/lamufivexodisuwasajedo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/1495335170.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/48b399cc0c06d135f35c6c079ae076e0/73961205563.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090807112873499.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/wesakaxura.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/eg79g08hbas0i8ehs2kf7pqu61/piwesaxif.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_192127_1048.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/99379333093.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2aaa20e2b46efe63c31056e52befeb51/32653723180.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a891fe962df5e0006e40d031881e23cd/zaxuwizeludumiwukemavenor.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/malovenikulidazi.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/41107327951.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/kipipavogejexuxele.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/11884897905.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/tazaluzuxiwa.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/norevoxuzuvofuwisigaw.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/69332216393.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/30635978902.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///7245787061.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96995338904.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/nugafoxuvilabuvaro.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142565dcc907---32880282281.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/kikilodorozamewexadit.pdfIn PDF document text
    • 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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10652 bytes
SHA-256: 99e85f87a87294ab108aaa7a74df93816962bf8f6e02850ec0f1cad318372c8f
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 17572 bytes
SHA-256: b6f319269d3c272e8c78292eceb25e9fadcb315a92d9e02cf343511ace0673d3

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