Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8d1a0f2a614a85…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 19:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3724d7b617619bc8c9a6a380ae6fc2c1 SHA-1: 73a9c8d99c1f550cce3011192fbd93deb64c9551 SHA-256: fb8d1a0f2a614a85b4aeb38a8db029f5c29ef6a22bcb012f314233a206689413
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://chongtham68.com/app/webroot/uploads/files/83254891717.pdf In PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408cc045634---701973447.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/72257451139.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210913151423.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/fixuxurirazijixe.pdfIn PDF document text
    • https://www.znackakvality.info/files/44159473786.pdfIn PDF document text
    • https://gangnampools.com/contents/files/77376087283.pdfIn PDF document text
    • http://www.pilartangguh.com/file/61844680307.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d28b414e---29057594389.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nasize.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6tf9oac0pcm0flv8vdooecd0ru/11044490993.pdfIn PDF document text
    • https://emenu.hu/editor_up/zumodomuxinugi.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/wewoxudipiviso.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/mabomoxuxawo.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/xolejujodarugoruwege.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/12661658065.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/fevogimojadibabawaj.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/dezavalikikigupax.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/jebegokamafil.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/20122135666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=all+versions+of+android+operating+systemPDF 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_off0000ac2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2B 17164 bytes
SHA-256: 032c6f4d124ae74ff376664516a8478b1614708b49b5418b0e0e061a13d2c9bf
font_01_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 11000 bytes
SHA-256: f1e66d319d6d27176932d79aecc01b3fc1076e327052981b790f465bdf5723a5
font_02_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1