Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5192a79a34e93b6…

MALICIOUS

PDF

86.7 KB Created: 2021-07-14 05:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c6c1e1c765125fb0fafa2a238856a4b SHA-1: 51d5d89f77bdcf3fe979b12f8ee36d4882addbb4 SHA-256: a5192a79a34e93b6887e3a31905111982db40fc84a56a7166ce8d04331f78114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing or trojan PDF. The presence of multiple links to potentially compromised sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2dbb8901380f11dc30a6912bb61249e9/jogekajibo.pdf In PDF document text
    • http://uniroll.pl/user_images/file/potidowagefamixidor.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f7f3d76c---90049841020.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/94630645390.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/jozekimujurexuko.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6e0e93d2---92055831602.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a8ae887c8dd3393923963027436a3dbf/muwipudejodojufapige.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3146fedb6880556db94212517676d093/46346529292.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb60e81e399---96827285680.pdfIn PDF document text
    • https://valdisieveshopping.it/file/96637641638.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7568e47c1c---tafizovevujebazizore.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/21f57e4ae6cc7880394cf911a529739f/votivura.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zizexilob.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/60537828704.pdfIn PDF document text
    • http://legalinet.eu./userfiles/files/luremerazedisuxuwidezata.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/nixusukuvak.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a4218802---1011976180.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92db9e99a---69609180983.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078517a30d4f---doxabugusezumarawemebow.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/75513552306.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/29055249815.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/11606377776.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/16394996236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=finding+determinant+2x2PDF 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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 17408 bytes
SHA-256: 8dfe48eb207a46268ce2a14900d05606ff4d5aefb128cf652f78b58b3b977437
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 10456 bytes
SHA-256: 86ba73221030e33118ecd4e3509fd70ddd37e9438e99e2cff60b9cb3418e8b9d

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