Malicious PDF — malware analysis report

Static analysis result for SHA-256 850daa3a32cab325…

MALICIOUS

PDF

90.6 KB Created: 2021-08-04 20:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 605c6fe401bbf2ae7733f2eb17492b84 SHA-1: 45aabbbd1a8a848ec7be32516fd7da25c353a11e SHA-256: 850daa3a32cab325648198ee5559e52031a846c35b99ad268917d0d3206a9a13
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://philabc.ru/uplcv?utm_term=formato+unico+hoja+de+vida+funcion+publica+para+diligenciar PDF link annotation
    • https://vresponse.net/userfiles/file/vokolinesagoxisixib.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/xaxapolutaxi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pid04tnuvlm4iguuolgeqjo861/79827385576.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2b4d46376ceced9caaea6890219874c4/buvenimujevubuloboju.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a4fbdbf092fc3c74575c31dbfac4bc55/dukuworobivivigomuligebad.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/jimejir.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a709ac3d05---lagirazedu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/duzabomebivodolosokamuteb.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/20088164994.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/81ed63292e53a3bedba4c79231b15537/75739877117.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/824ucr2q90jiahecal5t1719f6/82457041842.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/74397253835.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/20fk6dpuldqkrlp9golbpbmo83/gesogupowigiluxabelidejuf.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tavolotixadewifipojeg.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/kibesejenebepibi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcaa53822d---lisebetenozawuvigime.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/suzokadusilerubovi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ab08f4g757643eo3vflt72v8p3/47963285096.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/43837090228.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/rolavezekuwajunuwe.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/ximananut.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ec70d01b---87130469646.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 19160 bytes
SHA-256: b7639900228a40a06de06bf54c17a21b6e34991148b62cdb176220586a54a11f
font_01_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 11312 bytes
SHA-256: 07595ec1cd1c94f91c29b8630c72a5f323839a90485ffd775682e9af7be8f684
font_02_sfnt_off0001421a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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