Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f49b9efefc19fb…

MALICIOUS

PDF

99.8 KB Created: 2021-07-26 11:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5aec3f649f7f531294b4b38887071d0b SHA-1: 18f5ef6a260bc15d22c0625e4f6cc105c7c9ac2f SHA-256: 99f49b9efefc19fb135d2b30258b2ea775663321f227a62dbad31d1871d4dc0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://outspokenholland.com/userfiles/fckFile/20210713125711.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/jawopuxelogeferuzoteju.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85a0e7fde3b5aa96d27b5b6f6d30feb2/fonexag.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/pibaredoretadi.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/61387613203.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14163aab4---lonagevaganulit.pdfIn PDF document text
    • http://effektfilm.de/files/file/wanatarovuvepivigevawaxav.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072d48845fce---67730040277.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ff47dea7---kubolifinidofepofidonowib.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/90970906729.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/g9auhgv0iqj39o7p54fhu3n867/wedamupo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uim5hsrbahs9fg9amc8r3kl63m/depuwitoge.pdfIn PDF document text
    • https://egf.tw/test2/images/file/21470558414.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/pedidodajodokudu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849dedaa2ee---90871393913.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/31c0c6430a70d464aeb126345109423f/4252551101.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/10799877784.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/metogu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d190c12d29---24509270664.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tupopisiwe.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fbcf204f2413ca18acfa8079b99dfe1d/43223826558.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/rusitufedoxozukiratumaf.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b270790344f---fuzuvemifasafugijomutam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=lalitha+sahasranamavali+malayalam+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 17504 bytes
SHA-256: 007c45c3a3875ef3fa7fc1202daa92f03505e7643873ae10d0f1f582330fad6b
font_01_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 17356 bytes
SHA-256: cea9fa7b04b532dd6ad4d04fd3a150879cb97091e3f9dec8d311927217e48a3c
font_02_sfnt_off00014f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F25 10852 bytes
SHA-256: 3e997fd49542fe00bbf29af77727404ffccca262130ebf2646e91925a5241bc7
font_03_sfnt_off0001680f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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