Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1a51ee07615e99…

MALICIOUS

PDF

96.2 KB Created: 2021-06-30 09:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c9dab6dec7c65d69e791c7fb74dabaa4 SHA-1: c20cf6b0575ad23c1d2a896dc7da2249a859d4c6 SHA-256: ca1a51ee07615e998554474310e9bf75b554154998a4c2d2bd464c00a74d39c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=cabbage+and+lentil+soup PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79329b861c---tovenaluzukotomenimuzita.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/5401630596.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ceedbbc19---fejuleralotekorageturu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a514a1507---jibuzuvewawa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608491b74f4d5---bopegovowutiligad.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/tumur.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/zuzadisopujadelugav.pdfIn PDF document text
    • http://centromp.it/userfiles/files/33253997115.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc2f67ccf0---retapokojuvibibigidowu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780ccc74a4d---5546430195.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/suresipixobuka.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/folodokegexigibubo.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1c8h1kh0m4nc9hdmbet5okfjtp/34641732833.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/32288923544.pdfIn PDF document text
    • http://asfalon.com/__files/file/39470776154.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1eab2dc0e48acfed054814d06c31b846/tasurij.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/jojigiselelaloxekegekore.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160756525b7e09---xiwanokezoxamusijed.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ipomikavivigulimikis.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd85cef6b---jiminizalizomirebun.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/22302675768.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b350b0dc1cf---wujadalubuxosumojefufi.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r77qr10k46tim4isbe1op78h50/dibusaxudemafudimelal.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb61a96fe---45243254084.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_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 17392 bytes
SHA-256: df726aa6a332408df1b65905c04265735337d5db7145dd2fc9324a9283696a37
font_01_sfnt_off00014343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5A 10740 bytes
SHA-256: 51d595d00afe85f347dc534093916788383d7028ec3b3c2a9c9512feb6fa380c

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