Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f15e6e90de190c1…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e157ad754b74ff932510da2006ceb7af SHA-1: 99ad70b6096172376f7bd0fe5f6fb39e21d13d65 SHA-256: 7f15e6e90de190c1e64c0761d8f522b7caf73af31076c128e38f6d0da1a0c99b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous PDF links and the ML classifier's high confidence score support the assessment of a malicious phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bluza-shop.ru/content/File/binoga.pdf In PDF document text
    • http://ampletrekking.com/userfiles/file/99411680549.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/31364701802.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161385f0a2ad54---zesopedemufexuderoxujerox.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613939e71dc46---pefazuxeturoxigugosotadu.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26579238652.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kakibejogipaselaveboraja.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/42799858029.pdfIn PDF document text
    • http://megalaserasia.com/upload///niruvowemabimidenijasujif.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vawezafoperujaka.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/19155058577.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613334e266af8---25354551072.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/68293102761.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304fff86a2a---65038265425.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/4063845473.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/sanofubemutof.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/davorusilaj.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/213a3f48bef0d7317391f47972d74cc5/zonakuxebe.pdfIn PDF document text
    • http://podarox.ru/public/files/kefixijategasabimalok.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/kagewo.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/75399328190.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/89543037630.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/pawali.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/64339746730.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87153556950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+watch+logan+vs+floyd+freePDF 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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 19876 bytes
SHA-256: 162b1d4d3c066a66424a92eb300d28f02a221aa448110a06191a4f7d21e0609f
font_01_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 10920 bytes
SHA-256: 0280d1bb420cf00ba5844c7d42c589c3af56077842c2356c5bc857b199c0bd2d
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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