Malicious PDF — malware analysis report

Static analysis result for SHA-256 726b5d5750b93346…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 08:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: deb906e279bcb113ab005fdb2c487ab6 SHA-1: 8d0f8c6ba777158708e3ea956bea0e7175abcd3d SHA-256: 726b5d5750b933463ad9d5e066bcbc76f5d11ae05a0ccabe378c3eb5f24ce5bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/37821927396.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e061a1007ba605f7abc6665fbcf50845/23237929670.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613926509e45a---duxugilado.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/80b5rm6j3toqs7vus81ti7kinh/disavulof.pdfIn PDF document text
    • https://e-room.co/userfiles/file/bazixag.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/86305581820.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/63891838319.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/98269513154.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/88708805216.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a51589e1f02a8017678e49c6416475dd/futuponalopexudela.pdfIn PDF document text
    • http://taxfreepoint.com/file/96535167883.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/52121370315.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/tikowexugadebosotodaba.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37400555264.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/20598547806.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/faloji.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/kelitodolo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jajawotimikosepebipa.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/31923798708.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/selufamenoxilow.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/powesada.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/116bbd424c1f87cfaa370ad9e502fccd/gigokobobu.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/39064855600.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/niporupuzudawagivige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+internet+backbonePDF 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_off0000b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75F 15452 bytes
SHA-256: 9163930cf6997f6348386eb2ca16e55afd0141c4f2dc7b78b900b0e1e229bc02
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10504 bytes
SHA-256: 945380566c89aca11ae0cf29736b451f53a9f2f72068d9adbe983fc0658ce95b
font_02_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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