Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94735aecf4be9c6…

MALICIOUS

PDF

127.1 KB Created: 2021-10-05 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19ccdae1428fad250fc8d17c923d8401 SHA-1: 5f1f5e942f09702f0b1c11a075f2defda66db925 SHA-256: f94735aecf4be9c63d525e1e5edaf2ee644e183e7818c71481de0a41a0a67e52
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the heuristic findings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://inwebjor.ru/uplcv?utm_term=child+by+surrogacy PDF link annotation
    • https://ph2020.org/FCKeditor/file/finanufufavaderoruvumodel.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/90224303179.pdfIn PDF document text
    • https://10fci.org/userfiles/file/kodadakazajafutinapubup.pdfIn PDF document text
    • http://findacommodity.com/upload/file/74575394682.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/58664067403.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/19693257441.pdfIn PDF document text
    • http://chemicalengineers.ie/images/11586054006.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020724014251.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/tegete.pdfIn PDF document text
    • http://eurosolar.cz/res/file/8805397857.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ade37e0e40---71973261986.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xuzemup.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9143ccf---10066018874.pdfIn PDF document text
    • http://hainfelderteich.at/zekopepilate.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/72406018818.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5e38d10db4be3665ea395f31efaa398e/60614599820.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/jolutolaluju.pdfIn PDF document text
    • https://2winit.com/Files/files/92739583912.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/60244568612.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/77840833307.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/11367259165.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/retib.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/3c0a8c20a25ecc9f7001ce0965f6fccd/33372883937.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210920155003_o7cg82.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/siweralerojovalini.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/33571458091.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_off000185af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185AF 21640 bytes
SHA-256: 468046e8873d41d7cd1f581480ea29b05b21926621e0b72693c601e807de8774
font_01_sfnt_off0001bdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5D0 10700 bytes
SHA-256: 7ceb919955eb7ba3560f2ec62a3df76dedfb0d2cfe5fc254f848f6147b52b704

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