Malicious PDF — malware analysis report

Static analysis result for SHA-256 91172f55c6b7681e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 20:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61e6647d40d8d7589078af0ea1ece0eb SHA-1: fe37d0005e8fdd134d51c0d526e7bc3f5a91e962 SHA-256: 91172f55c6b7681ebe397b056dcda1ad2b59743fcff6f51743d8f286922d39fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links are likely intended to redirect users to phishing or malicious content, as indicated by the ClamAV detection and ML classifier. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://cructi.ru/uplcv?utm_term=townsmen+premium+mod+apk PDF link annotation
    • http://beijingxinzhi.com/userfiles/file/20210918045023_2036680528.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/05/mopopasor.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/mamojepulapitebopow.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zirarorobubena.pdfIn PDF document text
    • http://djapm.com/userfiles/file/66530052632.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kugagitumabiveza.pdfIn PDF document text
    • http://tion.hu/upload/file/lopogomulaw.pdfIn PDF document text
    • http://djpress.pl/Image/files/98134233689.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/sagiranitoduwer.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/noretire.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/moxononipisikazoxax.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144d557f1335---58256406630.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/43616031388.pdfIn PDF document text
    • http://unsersohn.com/images/file/sedezafedediwa.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/kikisuzixusotomizove.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/043304_31307746611.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/96702682963.pdfIn PDF document text
    • http://exima.kr/userData/board/file/1872082255.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/90601493913.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/alb8vd29hhk4mn1eg7o1ju75t2/sefovupudiputej.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/jiwinifejido.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/33929359671.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130c01ebe360---wawivanakurugowor.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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 10652 bytes
SHA-256: c394f6675a7be749595964f03a5f97b52c9b89a121989fbbb8be4f860e4c4f73
font_01_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 21252 bytes
SHA-256: cdf7e8cf589427574ee14de1f55efd0e16257092ecf65eee0d640bd644701108

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