Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3b70eb805c4bb1…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 12:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbb641abe0c49ffdccbd19a2f1610a31 SHA-1: 9e33bc03e0c89fa502a3d25eaf0b9073597d9b51 SHA-256: 5b3b70eb805c4bb190c7442aa44f1712e57084d14eae1dddcc5152e530924f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of numerous links and the use of UTM parameters suggest an attempt to lure users to potentially malicious content, such as phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=anime+hd+watch+app PDF link annotation
    • https://anninhsieuthi.online/upload/files/surajakarofigupinuvitizof.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/99479303896.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wufavanetap.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/38673135023.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/af7877a61ad8ccdd591168eb8b389b69/7009073587.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/22737445206.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eee977f04---10014486007.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/zewotokux.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/dokefexivop.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xeduzimenanifida.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/32380230217.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/gemimalorugapotegizut.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/katutogitesozo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/91136776322.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/vofudemufodovosa.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/76601615311.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/90208989741.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab7a208d3---52120735741.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383723af6b7---ginewurugewege.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/pefotezuxunupi.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/tazojaro.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zuvulamisaxobedosagu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuvunezenurunakibo.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/95295328855.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_off0000c9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 17104 bytes
SHA-256: 45d978c8463a896228baca578f9daf7df659e42a75eefa888c95488bb8c2a8e7
font_02_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 10412 bytes
SHA-256: eecb96477103b97a60d83462da00f41635704a46884aaf90c7bb09280fd5e5dc

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