Malicious PDF — malware analysis report

Static analysis result for SHA-256 43abcb7ccf39aa80…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 16:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f400ea3760adebbf95ce153de9d2827e SHA-1: 63364b7893cd9280ea3ef928dc8692759569b083 SHA-256: 43abcb7ccf39aa8021c64d6a776694793da9e38d0e9c62cec2e6d5787baf8f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/c8443682396bce61fb807aec2be2bdf3/bakadojivoseturugomuxi.pdf In PDF document text
    • https://adsbudget.net/userfiles/file/31508674530.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b1a2fc63b8625e18400d6a9fc2bb8023/27042157512.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210621/1443096206.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/zitusugedunagotifu.pdfIn PDF document text
    • http://vodnik48.ru/content/file/34958649102.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610950d59f184---xagemukudasejukuwu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vajigetiv.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/lavesoko.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe6582e18---5884727051.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1631348c29---96071696886.pdfIn PDF document text
    • http://vizcsap.hu/files/file/bekaloxopidasol.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160752b0be16fd---53849746902.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b979c528a---buzarosi.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/11259545510.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100633fdfd1e---kegapinidajuzura.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/navodovofami.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/posazojelevutuful.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/jaduxasodeb.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/22f3k1q2a58aks4ad1sramhi1k/mutokoruzarudozaxuzitebi.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/wanibogaxezapozix.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099d88b4f570---towigameruga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=oral+hygiene+essay+pdfPDF 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_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 10700 bytes
SHA-256: ff9d45741cd6685d752c20233ce9991bb8ddae99850829fc421d7ced7767fa16
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 16548 bytes
SHA-256: fe859525e0a6ddc9266fb8d0c000781e2c396e5447aae37cd75f30c0f80e94ec

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