Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9042e444a40c33…

MALICIOUS

PDF

169.0 KB Created: 2021-07-31 23:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfe2eeb2b68838749c79d22183975bdc SHA-1: 7c20a97981c2a13ae1d59e6161bd46a9cae42030 SHA-256: fc9042e444a40c3345b8f04a0bb209abb4a1c8f5ea4fdcb643a614132ffd3fc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://teleinwestor.com/userfiles/file/61730186175.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/wanuwilosenukulaboj.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/gigavawuko.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/zijux.pdfIn PDF document text
    • https://bloomeng.com/uploads/98069788222.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26560a2c59---40435167656.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b984e2875dc---15606120009.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k3rt78asgessum536r892odoj5/94732622796.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-9/20210709103514352119.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pesebapekizelalojolip.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/29001743393.pdfIn PDF document text
    • https://businesslife.com/content/file/65613909602.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/82679750270.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-12/20210512103306687353.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a8ab0f67538fb3e8027e7824e179c7f1/92433039072.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-7/20210607104739120497.pdfIn PDF document text
    • https://memoservicesrl.it/file/gavidopavunuzovujizi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8h62ho0u04al9sacpr0gfmgu90/76158732617.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/daroragebegutunovikofe.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070474901fd3---5904778310.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/rixesexabasixipiwatis.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/sojujesegikawejabimapabax.pdfIn PDF document text
    • http://groupkaishan.com/d/files/11769223563.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/10529757824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=robert+adams+silence+of+the+heart+ebookPDF 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_off00023462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C74 17300 bytes
SHA-256: ec648563e3bbd2ebb182ffe58034e48ae591232b4008ffaa2ace909f1cc16642
font_02_sfnt_off0002797d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2797D 11016 bytes
SHA-256: f317da43e9302b97eabad6d098b4df44d54e10bd8f829309fcc2b2ec6a425129

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