Malicious PDF — malware analysis report

Static analysis result for SHA-256 698fa0a58cc0a8c8…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 17:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1157e17ba71055e59a1535556cb54854 SHA-1: 984640918e3a516fab4fe68c485d5deca908bdc9 SHA-256: 698fa0a58cc0a8c85f41b9349f184e5c9ba4db5c680ed1bedc7300a49553aaf9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f52d036---33479658291.pdf, are indicative of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://anaminfo.com/attachfile/file/bejifobesozetipani.pdf In PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/fb058ab93bdda700cd9642a79ee33ece/bemos.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/bupenemo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3dea0b9b---runebadazewirogalebetusem.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/11687060963.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/29417460044.pdfIn PDF document text
    • http://katela.net/userData/board/file/rogiwavusugegemu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/67590677676.pdfIn PDF document text
    • http://vaithun.net/upload/files/lunofok.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109100852008586.pdfIn PDF document text
    • http://zerosquareonline.com/file/70545773443.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/58886530422.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/73765791372.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/59543026601.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/wokiwuruzirupezev.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/99626329848.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_EC4D37009B76FCAE.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/loxuletudozumafudemo.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/29216915140.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/65119195029.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95148057866.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f52d036---33479658291.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/26162990403.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/41212911443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=php+fcm+pushPDF 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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 9992 bytes
SHA-256: d29958e5b860731e62a03edbe78162a43649602a4e888492a945ab12289f9d59
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 17120 bytes
SHA-256: eb2544110d0dfaada3a600a0ce48aca579816ab47928d8e17f851d867ceb5c51
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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