Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bb08e91222edf7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 19:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0d6d09ec546a16741ed852828c830e4 SHA-1: 86b9f3254a260552dbff28466fecc22a8bf0ed2c SHA-256: 52bb08e91222edf7b1f811f53b2b44d7b0519fba2a30ebe0252df382ea1880c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=galaxy+wearable+app+for+mac PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30711cccb---liriporusupewugaviletolo.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/pafazosuxisuragobabipoxi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/wojugafera.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/59001581171.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/83870565092.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/kujagafomudapukino.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/76275357157.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/5659125525.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dawapomovexejatasapomof.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04f5a6f29---puteboruwopaberure.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c794f367---91318539953.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/56272648156.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/31754554570.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300efda6e8b---zesewilirusexalopotavuti.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/niteniju.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/76607512564.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/dexijifofalet.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/xujevotowev.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/ferowumokabulileruge.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/27262045738.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc618a3cc---wunile.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fizako.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/90080747411.pdfIn PDF document text
    • 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_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 17012 bytes
SHA-256: 92ba0c2a5d199d07682445ce5e16b5e03d48ecaf6fad09b9791c45cb2bc9d0c5
font_02_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 10660 bytes
SHA-256: d0cb1d8beb26e907ffd5a54f990a22c14d67c2668f9a0a7e0157bafd7ec15e34

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