Malicious PDF — malware analysis report

Static analysis result for SHA-256 0603e92e22a4cb05…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 13:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fac2c8140ae16d81fc7bb33ef1bc39dd SHA-1: 3955596601f1c30742d0c2f8fdb53dd4abe16765 SHA-256: 0603e92e22a4cb059382a1ce16b8fad7124a0fbd158b5a2005822a1769ccd6cf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.huntsvillepr.com/files/files/36568103434.pdf In PDF document text
    • http://netinflux.net/userfiles/file/mugozuz.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jovesafikopawatunu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/17015492492.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/guxajozixujufudom.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/28225606955.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9r6iqete5q655e4042aq0ku5j6/79435778609.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bc38c921---94998505893.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/tubamazovukovowori.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rfprp53p8r4d5df0p2lieops06/jalena.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/26792120106.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/rutokulewebutapafuxe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ca98850ae8c45c2203f012881280e20/79227462188.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-8/20210508081220769764.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/38016190597.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076843e40ea9---derudapuzadinevubow.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69915955779.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e4ce948bb4c1edbe887c0b302134becf/94773146067.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510055299349.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764fc6bccd8---temuzazese.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/65993505797.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/zelubal.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/fowoxetilugowetate.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/5448718190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=explorer%27s+guide+to+wildemount+pdf+free+downloadPDF 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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 17496 bytes
SHA-256: 72e7ed2ed9e4545b79a4764cfa8f5f07274c103cf4dbd6ca284472cd6481ce85
font_01_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11144 bytes
SHA-256: 2a0ffd15a935d7d3045a5b17ab30be2c3fbd85e0aa4162d9216bf97033720b2b
font_02_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1