Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ce610c2d104f80…

MALICIOUS

PDF

94.4 KB Created: 2021-09-03 20:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af4ffba822fa0f39b922d6a9ecfb35e2 SHA-1: c60caf821a3a29c10d92284b3c7b42cce9534b80 SHA-256: 38ce610c2d104f803192c7f65d53e26b74776cc2759d72b34a4b89f9118bc559
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://degrossier.nl/uploads/file/lilurew.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/9atsudiln31frjgkcdnolobvp3/koxamufixodawu.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/81463630375.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/dakodurowepo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/50413158647.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ea4d3435---pomuvidofikeni.pdfIn PDF document text
    • http://cosyromania.com/media/file/89131942155.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/musisikataxumaf.pdfIn PDF document text
    • https://bagstyle.uz/images/file/purududidulifanozaworad.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fufasanepixunanepegelow.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zerurebaxodidipejisewod.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e160f7d03db---movirisesinevitat.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/gakavezamedufaviga.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202173114850.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/48563458531.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/dojigujeki.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3046879389---bodibaxokanibap.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d7p791desn74h0i9rc63baf6k0/62558041971.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c60424ce7---firokojobi.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/27893764832.pdfIn PDF document text
    • http://uhorder.com/upload/files/93497458872.pdfIn PDF document text
    • http://szpk.hu/_user/file/benonakuvasibilibilu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c08097df639---likefesovuxudaxew.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/xinojizipabilela.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b8b2089aa---noxazepegabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=garmin+forerunner+920xt+instruction+manualPDF 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_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 18360 bytes
SHA-256: dd0730054ec437561349746a49a729bd3d0a701fa7d215833166ada346e4cb1a
font_02_sfnt_off0001515f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515F 11148 bytes
SHA-256: e16574ca3ddf15979f563e6aa504cf8b2a7d7f80552ac6ba837aa4ce487c40eb