Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0847036a0e0cf8a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 14:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21911a67bb5c5cb84d9aad83f8e49838 SHA-1: 826fe97f0fcf8f63f1b1c8f2655c04857d9bd8ea SHA-256: c0847036a0e0cf8a560d0808d341ad8e14ae86e239e0514ab40b2c494059ea4b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV's Pdf.Phishing.Trojan detection indicate a phishing or trojan distribution intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://nordavril.com/userfiles/file/48539179.pdf In PDF document text
    • http://nesthomes.in/userfiles/file/70261919204.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/mekuwijonumasuwuwiwuwakim.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gewitemafutobopozinubob.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/th59j6snisekfe4cp4vg15cdk5/vogol.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca954f0e1---75936713065.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/sugitupevarewirumibafo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9359e9cf55---83234254107.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2886888280d7c4845eb402a903431ce0/54582539171.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a11a48cea134c2a6044da125016f1436/82171655899.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/jegezojafarisetim.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017146893b---86541195744.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/jadub.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/78236a2042d20ce5e4d8db75678c0cd6/jukozutejipasigowu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080504d6885b---52137265248.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/nudobixojeluzi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34be60a244---kovesufekafusibefus.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b85334023c47f65b3386c4c9d9038760/dozala.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/45209788855.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/gematazadewedutirevolu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/85423815552.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/28167713904.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/15393919801.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/13537405995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=invisible+fence+boundary+plus+collar+manualPDF 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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 11056 bytes
SHA-256: e17e9bbb3dd2b88c3c1efbdbe173b8ccbcf7bae7bc7b025e4b1e85c6cfd892a3
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 18120 bytes
SHA-256: 0e59b8925223186ba577d90898ec4155301e67a382b08e11d8def787607d37b9
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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