Malicious PDF — malware analysis report

Static analysis result for SHA-256 9158c830fdbc1082…

MALICIOUS

PDF

77.2 KB Created: 2021-09-21 02:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b5d954d7f5d2cba2f5791881cb121d8 SHA-1: a8e5cf9c6f12eccdea3f275e2685cb49c3010e69 SHA-256: 9158c830fdbc1082143ea1fb83ee32a68f752f93452db2b2118bdfa62fb2f20b
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a ML classifier flagging it as malicious and ClamAV detecting it as a phishing trojan. The presence of a 'download button' lure and instructions for a password-protected archive suggest the document is designed to trick users into downloading a secondary payload. The numerous external URLs, many hosted on compromised CMS uploads or disposable domains, further support this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=download+gran+turismo+android PDF link annotation
    • https://haciendaloscipreses.cl/upload/file/jopozogeg.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/6147331247.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/fevaboronoxulut.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/baxujebanomoweru.pdfIn PDF document text
    • https://combrooncom.com/contents/files/fokilalowilazonanasume.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71808873388.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vomilifinugorajorazijoz.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/doxulozejuj.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613e060cc918f---vanopozuruvudi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/zoramuvodidupijejapejelos.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908140117.pdfIn PDF document text
    • http://elitvorota.ru/f/file/34851004519.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/82923901387.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fd57c67f1---rotubodov.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/3784687969.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/kefopaxanuzex.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e39752f23fa431ee5a0669f1e1885210/80464075089.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/gijireza.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/48961712359.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/34525520622.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/fidatup.pdfIn PDF document text
    • http://d-innovation.com/upload/files/pojelotosirolojirig.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/banikosubizukanetive.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/44889531544.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8ac654dd---tisigezokakexusomitoxaner.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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 18284 bytes
SHA-256: 488b6fe7bdb9561f422708dfe3eedf10386df89c023bca8f6373564c707105aa
font_02_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 10648 bytes
SHA-256: 70f0991dcb4574729f8d03c3a6c3414375bca3aefb67e9a133258c26e508790b

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