Malicious PDF — malware analysis report

Static analysis result for SHA-256 be04b691100b51da…

MALICIOUS

PDF

90.4 KB Created: 2021-08-04 16:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0622e298283f4cfcc8c1d05dfd21c87d SHA-1: 12cae911555ae73843c58b20814a0c785118df72 SHA-256: be04b691100b51da210bdb2e879fbf457d4deed9e71b65ff7d83b09d4c45de6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://smidgel.ru/uplcv?utm_term=skyrim+bleak+falls+barrow+puzzle+owl+bear PDF link annotation
    • http://baggiez.net/userfiles/file/14573883205.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/65010215043.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/92700165075.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0735cded---7423866340.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/jagibotuserafanijurafivum.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/82491932227.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/50190947088.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb7b5e---zukukumewetukosewedasi.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xosafoga.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/refidopejos.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/13806780217.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8017a44c63a9e18478237fb3d640b4e4/pokagubosu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4f3f5851075943adc28e17ce45836e9d/sarenizorazorulu.pdfIn PDF document text
    • https://kermanrooz.com/img/files/35231806222.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/66527377174.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/dilejitosepexujupuseju.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db44f2d15e9---20587190574.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/mewalunemalavopuk.pdfIn PDF document text
    • http://willbramephotography.com/72069237147.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/dasitogetirurel.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/52114116089.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9lel68gt1l0m364ufca2d20p8k/vuvuziwevosus.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b1758bc61d4cee4a60d6593932ddd578/90687617600.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/tpndinoc52knna9gvid3kpdq20/fesebusufatebagoseburiwod.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/segixu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/92237445045.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_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 10984 bytes
SHA-256: fe99ff9fd5c6e87b9a9b1aeb71863e861a85eeaa1e889426a263d152ea06a05c
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16768 bytes
SHA-256: 84ef48cb6412d8a7f401c835a386560155862b4c80e471bf61376854e7cd7b7c
font_02_sfnt_off000142b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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