Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22fcc9985347ff0…

MALICIOUS

PDF

77.7 KB Created: 2021-07-09 03:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0c21ed9ca4fdc4df3a6c958c0f392a6d SHA-1: ac9a3075bf67ab55f850d6263713d7d373e5b149 SHA-256: c22fcc9985347ff084acb7363d615ad8c8620b41ecc652f4c00d0f8498fb0c16
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://irisapp.cn/uploadfiles/fckeditor/20210625/file/16246362752308.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/lazib.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3p0dtrdanuru2lljffr8gfttk7/mizulisoke.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4dc36d2de8e408c9338c261ee8171967/70910864229.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ecb6f01ea988e328c8469f197149995a/zutaromuk.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f23ad48c4---27809752728.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da98170f1ad---27302230603.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fe2caa71b212d73d34f431e1844071f9/nulegosotevotikap.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a213dce9---50064918559.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/geribebotedinasiwa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf55a73201---kogifexakoxewaziz.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/6903038840.pdfIn PDF document text
    • https://isosklo.cz./uploads/99757180680.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/leishkri3nsonr131mcpuq5qdp/nanomebano.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d189ba1a61---mufilinepakekuruzujix.pdfIn PDF document text
    • https://sanidom.pl/img/file/tepukipirazexukiwil.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/7198566420.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c0c8d977c430ee204def4fb5af9e6d10/75535624555.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160942e2b289ab---59381882070.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7a787f85---sebodomelofekoxaw.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vowime.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/bikejelupubojavasutesu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/sazisirolirusotowu.pdfIn PDF document text
    • https://clubon.top/uploads/files/dekujuvizulamawivek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=factorization+worksheet+with+answersPDF link annotation
    • 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_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 10496 bytes
SHA-256: 3d083da4ded2ada784c8c4fe24db210c3170bf0e6cf7b72a9a1a85a7f52171c1
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 16636 bytes
SHA-256: 8805e8f4f1886cbddcf8370625a6816fdf40aec1fca4ee01b81268ccfc6f92d8
font_02_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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