Malicious PDF — malware analysis report

Static analysis result for SHA-256 950c61d10f362d87…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 04:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e44ecebc1178f35d68f135814b0a88e8 SHA-1: e902be4e059e36c4dfc1ce69fcab1712d5fa880b SHA-256: 950c61d10f362d8702ca403ff483725bd2fe2af8e217acf56e17d76933f8c544
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack where a password is provided to decrypt a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://infrive.ru/uplcv?utm_term=fishing+rivals+mod+apk PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/v5pv7tom2rqb8p9igops49nfaf/tisobigexofibo.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/40008920903.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/48679253874.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af6b72e6c---46223433200.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/sesisatazimilib.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///zivobin.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/sebolatosudilefanutave.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/jemejugetetevivufadudubek.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612effe18af5a---fopaxinubesajupi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zebawipibanijuxobogowowop.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/ganefosusaloko.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe3acf0a18---julapokudowodavopedirenem.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa4f58faf---58418897433.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/lenegazulavedojadij.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369027e6a8b---senifewixefara.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/pebivobama.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/40226512187.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/86401432014.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/60271272223.pdfIn PDF document text
    • https://solturism.ro/images/file/50925043296.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/lakixovegitubutuzuf.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210913055019.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/ruxubefazupudakaruje.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/fagilol.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 17656 bytes
SHA-256: 7d95a280ed85ec91710607f519395bba1bad478715419cfc842d5f739dbca1c8
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 10744 bytes
SHA-256: 6db5659d773e66825e2199a802300b9f9e2acd48c2f4e84a82b290af5d5739ce
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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