Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99836dc80584d6d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f7e668c5416bbed4a096f544ab204cc3 SHA-1: 28a7fc8816d8509d76aa5af7217be05ea52c52a5 SHA-256: a99836dc80584d6d760c2e71cabea801d17056f74592edd737f1918018b41df7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=fundal+posterior+tamil+meaning PDF link annotation
    • https://akproauto.com/nbloom/fckuploads/file/lebimuwaxuse.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a931a2d349---21161219740.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/natimarukokakibak.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622355729.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/xujimoragidej.pdfIn PDF document text
    • https://soechi.id/userfiles/file/wekotewep.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f824b78e---giwonumazekipa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bdbeb31f---24199194686.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/pivimugodilununonasex.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f63da617c2---remeg.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/59388db37b115a0d9970536ad982c6aa/61261758903.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46a43da25---dakanedoduvafonisobir.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/79405697130.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6422c182581f97fb1f84d8ac9b79a012/jiwifivulezimuti.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/vodobugodereweluwajaw.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/o76briu6cg9v0gg2h8u4ars5qk/77229942400.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/kuvod.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609248bbc242d---82408925036.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/27699099409.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/sebegumatipobopibujovo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4b61438189a80ac5690c8b0e1f5fd086/pesedijejugubela.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ef498f07---43934132455.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 10812 bytes
SHA-256: 5a07f883141837fee007cd7daa4755dc636718ebca3cf00c4902f2cc2bf86e3c
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 17268 bytes
SHA-256: eaf5576da8ae8166a2c315fcb7f0157fc5a717c2b7081da661d8fd3f55fa84ae

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