Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2afea2b31a9a69…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 04:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be241cbc978070aa696873473c27b5a2 SHA-1: eeaf69345d279dc905d8b806416a31856d503a62 SHA-256: 8c2afea2b31a9a69a90016814f949a78ccd068dd1326828ab0ee58da52a18ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The URL 'https://queure.ru/uplcv?utm_term=app+store+application+for+android' indicates a lure related to app store applications. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://queure.ru/uplcv?utm_term=app+store+application+for+android
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ef595e2d---14300805851.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9b05c5d---31221775651.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613072dbdf880---buxavedezok.pdf
    • http://mamtomchabahai.com/uploads/files/files/51208251238.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bbeb626dd0c20d0f9f41cdceb245e2b8/womininaxexemamudim.pdf
    • http://liweisteel.co.th/ckfinder/userfiles/files/49048812613.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3d421bc---7475942579.pdf
    • http://www.deopendeur.org/imgUser/file/21918061555.pdf
    • http://www.sushmitamukherjee.com/fckimages/file/kobagedowolixej.pdf
    • https://czus-lukasa.sk/userfiles/file/sisutesufudotap.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/sazuxasivas.pdf
    • https://mandarinusa.com/userfiles/file/1631724314.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73208d7---rimofonusinapesuzipavun.pdf
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_06A04D55F7B37768.pdf
    • https://stormester.no/files/file/mukosozalakajapolo.pdf
    • http://svenskafik.se/uploads/fckeditor/file/kapilolepadababa.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3552741953.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f2213669---tatavujozekolejet.pdf
    • http://baigeleather.com/userfiles/file/morozexud.pdf
    • http://riverhouse.at/pcms/content/file/67830075818.pdf
    • http://lmnn.ru/userfiles/file/1467900395.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fefewobubuzi.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549aad4e54---wozirikevut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 16792 bytes
font_01_sfnt_off0000f873.bin
e3128a3cd9856f3c42dfe3450c20d1a60e6a40827230d93ec9ce302bc219d8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 10596 bytes
font_02_sfnt_off000110c3.bin
9875da5360479004e00bfced9c6890c02c825944ccc071f7e0140f918b69d75d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 17792 bytes