Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d907bd7045ad9ce…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 08:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5e914eccde812f70d6ef9dd8634aa01e SHA-1: ebd35dfe06d286694651ac0b8a434f34bf670cc6 SHA-256: 7d907bd7045ad9ce3cf964415d89659b3f1789bb55a764beac0ae0c854f5870a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further stages of an attack or phishing. The link farm structure, combined with the compromised CMS upload links, strongly indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=jai+mummy+di+full+movie PDF link annotation
    • http://peoplefoster.com/pliki/sagenazebokuragenake.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/3622743781.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219251445233055.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/pukezixozemerefexidi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e615e7e6d7---58153352893.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/16335184455.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zisavavukakifukiru.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/pexovaposobiterog.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gukojegeviragetajinegepe.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/29968105114.pdfIn PDF document text
    • http://archbot.pl/files/file/41519299951.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf4d221f7---zazunujoripajafetepez.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vuxasori.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/22350891386.pdfIn PDF document text
    • https://ccskin.com/geektic/files/bolimetozajiduvakosedose.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/pesesitifatu.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904173551161397.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/81940937556.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/xozukoful.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/3523005175.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d138c38c8---pidujep.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/2ef37071623d7db84edac824beb6d5a9/14921961477.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zogezumazar.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_off0000b2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B3 15436 bytes
SHA-256: f5f5ca97a49cf697b66e0f6a138c31fe9e68266aa39baa5906ee9ef62a29606f
font_01_sfnt_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10316 bytes
SHA-256: 6d7c277e47a7c6a76ccf1c954201ca8f1e1758fe99f89b9a509d671d3b48b9a1

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