Malicious PDF — malware analysis report

Static analysis result for SHA-256 0457ff06de7f851a…

MALICIOUS

PDF

90.8 KB Created: 2021-07-22 10:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 95969f34ea6af92e608a72b889fca107 SHA-1: 930dc914b28353f7e79210b21e753852b38b1910 SHA-256: 0457ff06de7f851ae8af4ce961df1da8ec3d3d6bd103a39c7a74f326303c4b3d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to distribute links to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catherine-massage.com/ckfinder/userfiles/files/82628369872.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26aa39e69---9363240910.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/438c5a8f653c34b01606727d61a89d82/50035701402.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/19154344987.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a7db1ffa411d2d7702ff105bf532e2d1/25963673829.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qr1ueqhcg0q7b4921tgbekh83q/sevosiwojawekupujebulav.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-28/20210628132930575042.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/nuzitaxaliz.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/12838611788.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/54205951388.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/i0biu782gc8ltj8vn5obs86fa0/26964487638.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1rburhliqd6g7n4l76de02ndt7/22672529029.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/vobosefipafufotu.pdfIn PDF document text
    • http://getvisa.ru/images/File/2241479866.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/869ce53a896df943bd1f9c68be08f2bb/tadivowif.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/41644281484.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/98694094181.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e0f4bb3d3---vegutomupezatosopen.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/bopabunazadavef.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813afbc8d70---11309519020.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d59eb1d14171ee35a7f6b16ca8a14033/kemikigazasizabapajog.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e5fd43055fffc1247add21173d57107a/25096102809.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/12792922811.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/72980544660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=its+been+a+long+time+since+i+seen+you+my+friendPDF 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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 11124 bytes
SHA-256: c635ad43bf23abc620348521f6ef51d29192b179a94767f4894b0399409dfbc6
font_01_sfnt_off000114ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 17292 bytes
SHA-256: 939eb4871bccc1364c097e1f466d126600829b7a1fec073857f089198c4dbc4c

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