Malicious PDF — malware analysis report

Static analysis result for SHA-256 6983076f4de66ae0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 01:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5970d97231573b1308d893a38de98998 SHA-1: 4f4a37d9cbfbe7905bf90f41e820e4cf33203bf4 SHA-256: 6983076f4de66ae01bc7cb352a6a07f4e2145b1110c76cfe8981e5f606f252a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 http://igigeothermal.jp/userfiles/file/mosanexasizonunov.pdf In PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/97061279107.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/pusaresabawevoxaliz.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/gijajanexuniterozevoz.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/92571343891.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3149737c52bb4a8665c4d43298276107/zaviwaduremod.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/razogolune.pdfIn PDF document text
    • https://emmaushuis.org/pages/17160042738.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130530971145---33742274428.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139641359813---sosun.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/84011652394.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/57791863735.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/31065217724.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/22176042431.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2a15cbf1281d96375e6b5e71078dfb5d/25400346178.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/48864026036.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/rasedovigefexezaliwi.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210905004903.pdfIn PDF document text
    • https://people11people.gr/uploads/File/31576204848.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/92068100830.pdfIn PDF document text
    • http://fohow77.ru/upload/file/91293105239.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/8931998839.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/dibuxijebazedodozomisep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+put+memory+card+in+phonePDF 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_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 17324 bytes
SHA-256: fae37d30f998d6ec0d71f273c22f955fc49c6076502065266bae51c963611378
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 10856 bytes
SHA-256: 3de1860d10d0d319e129153e331dd46237d3e04d3fa4ee4e80648e7b093adb80

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