Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7a88aa70a7ec41…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 02:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c29d29329975b7f79b4d71ff3e6b871b SHA-1: 9c2f82a67d3561841cd5ff5704a068179c3d9527 SHA-256: 8a7a88aa70a7ec4178195bb148ced2d9beb95e1d6755fb61994b96f43e00869f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/934454bf0fde3197c205abaab833d3cc/63203739099.pdf In PDF document text
    • http://seednseed.com/admin/fckfiles/file/konerurodaguxuzabalenok.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/18180497273.pdfIn PDF document text
    • https://landi-bg.com/images/file/35104041701.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/tatesagudav.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/jesivizejibapovovadami.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/vuwonilizatoxelus.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/94859141800.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wejekol.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/22565342115.pdfIn PDF document text
    • http://tochalco.com/uploads/files/nedekoletopemevinime.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/86515410846.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/gaporokatedizemike.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/rogefumunotivabotalevogaz.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/516872162.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/48706562802.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141564967484---73423512299.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/lasala.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zefezudulinuvinadevivuto.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/41750726731.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69d28bc09---943269747.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/7398303701.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vonepozevalapotupiporame.pdfIn PDF document text
    • http://chinahongji.com/d/files/40255077416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=snake+game+download+for+androidPDF 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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 10684 bytes
SHA-256: db6b5bdd18c5ee14e907744c1a8c6a549a955e045ddaf42da96237a59d0c6db9
font_01_sfnt_off0000cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD29 15048 bytes
SHA-256: a09f6aa41436cb2e18b68fe477125dbd70f6105e0b552f43da3eb738ee8e4924
font_02_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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