Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb4e4e9510c6a68…

MALICIOUS

PDF

100.3 KB Created: 2021-09-23 07:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a40ae86a730a0797fa6a35c96a7dda5 SHA-1: 817cddc18ef000baaaf787efca7732cbc0b42247 SHA-256: abb4e4e9510c6a6887721745c2444f8d698b72abfed5c72fb061755871770cd5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many of which point to other PDF files hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://cructi.ru/uplcv?utm_term=world+class+fixed+odds+apk PDF link annotation
    • http://azseal.net/uploads/userfiles/file/zupemakirisapimep.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/riketap.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dugidomut.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/zexewokomor.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/fapizis.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614159180b9df---xuzozo.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vemakevuv.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/toq66mit2vnvhip0gt6g1i6mdh/34071838716.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/75284026027.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/guzaxakapuxewavo.pdfPDF link annotation
    • http://evrokomplekt.ru/userfiles/file/diziminufi.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/39744811975.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/palolujekorexe.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/32220625976.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/40093871118.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c011caeb6---vojovebexa.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/64862714994.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/36609794586.pdfIn PDF document text
    • http://dptech.vn/uploads/files/nozomewiposibes.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/72439791855.pdfIn PDF document text
    • http://xsteelstock.com/d/files/35396219157.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kutetiwabawudaf.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/xalegirujex.pdfIn PDF document text
    • http://veitali.com/upload/files/92279505825.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zoxabor.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/mixolirotate.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_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F33 16760 bytes
SHA-256: 6b98709c2a157c726fe05b058884653aabfe5003908ece821bb861757d6118b3
font_02_sfnt_off00016a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A87 10600 bytes
SHA-256: f9b41af4e789b10246a27afad60b1ef2a666316c0fe414c68579e4a543b4b7c1

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