Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9e079a81e20d3f…

MALICIOUS

PDF

102.0 KB Created: 2021-07-21 23:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 350a8720097b65da8b4f9a1d60b25254 SHA-1: 7c3a11fc9233cddfa8d3dd85a39a4b41a68f9746 SHA-256: 5f9e079a81e20d3fc1ef67dcaa50de6a3bfbe27a5cb6ebb42c8eb4efe919de32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://shinies.ru/img/lib/file/dagad.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/9b2816ae0952099629b3bd22c7e9e862/mogijopofuzatetuwubufoge.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/kavepiborunonabemesikivo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7d56d2a55995e278f4a1bd3aa1130661/fugum.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/najidexuvukupulozufonuga.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/33d75b83e495df76e333b7388f203e89/nivimavimexufok.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e3764801cf0842d44b5070af728a48e3/jemulemoporiguwojoviwala.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/43922300960.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/11279545823.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a67ee6f5---tegusesameparopajugab.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rununuxijadafuj.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd6a41d3b---xizega.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/48538066115.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/37266678181.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e62c945f11b---zejoda.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ef194aa7bae4eb53e1ff7eed4fcd8536/zitusojid.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80d177e1---48680733853.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/wijemupexoxajajebepo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n3jf1lgl7124hc77lgj5ke1lbh/46776429761.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/mukarikodexope.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ae8652e6cb71676c1ef54377a2cea8ca/jeranezewum.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/770ij4mk99slqreuqf71bnegvq/vekutikid.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/repaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+witcher+3+wild+hunt+xbox+one+cheatsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c36abdbf6fc9998cc5f4d89d6bbad936/xipukafinokamokuvo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 11032 bytes
SHA-256: 8514aa90b1399204699a96b3b24f506733228b615612fa90fb6eb7c68c29ac01
font_02_sfnt_off00014225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 17288 bytes
SHA-256: 43fe1d5b1b7913a62c8d6e3f678a6f4cc6b5cf883c34b5d18c38aace49d50e15
font_03_sfnt_off00015b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 17632 bytes
SHA-256: 67a5fed8ab6e13056d26256343c4c1db99781cd56fedf19e772a92e4a2fb25da

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