Malicious PDF — malware analysis report

Static analysis result for SHA-256 081ae4f83ea4272b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 21:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22e1090dfa3b171fa24bc68de79dd120 SHA-1: 142562099cce5a07e7c5a60cb461d67b484c3e80 SHA-256: 081ae4f83ea4272bac462583f0c55c1d5f46c1e186bfdb313a1a8c962b3a52a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on compromised or disposable domains, with one URL specifically mentioning 'restore whatsapp messages android' as a lure. The presence of embedded JavaScript and ML classification strongly indicate malicious intent, likely to deliver a phishing or malware payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=restore+whatsapp+messages+android PDF link annotation
    • http://klusjesindex.nl/images/uploads/salazosodubaxuv.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/44550195707.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5762933067.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/74384672681.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/39400492308.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/fogadufepevujajatiridu.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37756477084.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenegukukogizi.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/99993444933.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75435443110.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/daluvone.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21653a594---putin.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/30156170783.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/ginuxijagavisaxuvapuzudef.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/34066528722.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf10a6c4ce---xewakikavotivubetujob.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/volosonivo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614371edc2fff---xefiximudaperupifapidawa.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/4084355906.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sakulavajavetupexidafig.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/22157558997.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135646a2cb98---15610979125.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/sezulavasakudegex.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631106843.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_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 17972 bytes
SHA-256: 2044f985cf2495538468416e57d0748a2ad02d691fff664ab2d5436f1d676c85
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10924 bytes
SHA-256: 7ed4b0fa5d6c172b8114204161dec508379fa73cc096580933751a1fe420f6c2

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