Malicious PDF — malware analysis report

Static analysis result for SHA-256 525dd960c37ee0b5…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 07:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7919e972254029fee512e16ae9d565fc SHA-1: 0815631c9e817b4c43ce8be1b3f812686bd127b2 SHA-256: 525dd960c37ee0b5674ac772e1ae85ba62ee74e42815d8b4ec1013d3ed545503
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://tectrongim.com/uploads/files/benazazodikimazug.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611a297b6b05c---nasikibon.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/nudetuforob.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e3d612ea---84573762675.pdfIn PDF document text
    • https://parfumzone.ro/files/file/52838082950.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/muvumajazopovepa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bufuxonuterafonuw.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/eadcdc04d655006cc3c0f6e54ac987ee/5485820355.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d625f5daef3f30f751ef5b79cd34511e/bugevavube.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/sagatexu.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622512769.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/30946196412.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113802121a71---bopufefovuw.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609822cdefcb6---83800346055.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71721020519.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec646a1911---87008209802.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/dodopusomejuxewetonubareb.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/42223208214.pdfIn PDF document text
    • http://chromatographvials.com/d/files/wusaxibepinawuruwuxajulad.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cfb418d2---pejitelu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7e6372bf2def1a5c361795d28e97e6a9/36672741215.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/83b629b9c94c5bd242d8b9c6ae672180/sazek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=surface+roughness+ra+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010de5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DE5 18704 bytes
SHA-256: 031d62061b6ffe491943d7ecd0e055a86383551b1013f393db0f5be1bdb43984
font_00_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 10840 bytes
SHA-256: 35fd435a08c904e7330647a073d027138d67fbc983a2da496a97691ff73d83c6
font_03_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 18600 bytes
SHA-256: b542920ee83d56c8c78b6cbee36f536abd610dd7848356689f2ac83235cd4b4f

Open this report in the interactive analyzer, or submit your own file for analysis.