Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a44da567b86f38…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f515d1db869650118bf829dd7feb3cb9 SHA-1: 01e26a3284f3050243b60ba5e7d7899099fde4b6 SHA-256: b7a44da567b86f3862a64fe0ac0982cce2b408ae653a74ecac2c7d095b32d24d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The primary attack pattern involves directing users to these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://daaeportrett.no/upload/file/savezizove.pdf In PDF document text
    • http://hunting.kg/userfiles/file/nelupomusexerarojebinagup.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/86183979279.pdfIn PDF document text
    • http://etkenkalip.com/files/demetaludilalatavalogig.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/jodalerive.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/41382297674.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/41224053104.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6kbfm89gfrrr252flu5t78r607/68898400884.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/30513215662.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/28418872893.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0d102584822ac3062c4a7349012c0098/xuruzasumuzepajowenimaxaf.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d6e2b18c08d4307fbbeb997497968b08/lebowedabajitokabupufales.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/zavuluzubisurup.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090700575973499.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/gisiwokagajitorimelux.pdfIn PDF document text
    • https://ijpdua.com/contents/files/padanub.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/37494112639.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374565f2c61---xivojijivazitomupigita.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/vgj5ou2brncg7jfked61cdbofj/zuwenepoxavexoxo.pdfIn PDF document text
    • https://actorconseil.com/files/file/25877548828.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/nodikemagudaduzive.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/51787744266.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/mesubojo.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/91425097568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=make+conference+call+on+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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 16792 bytes
SHA-256: eef006fbf3c1f6990a76432873d201b4d40c6222ba6e0be69d8d447674cd788f
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10288 bytes
SHA-256: dd42ea827f27db8c02c0f5c94d9a8e7586ca59560be6e42d2bb0e7759b3c5a7d
font_02_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1