Malicious PDF — malware analysis report

Static analysis result for SHA-256 685ad16560db5533…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 21:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 401bbd68697d3a944428a00438ab7ad8 SHA-1: 4bb02736eb82b0d16be51d6948ae5e0c8d3df3d6 SHA-256: 685ad16560db5533a1db8b344ea1bee24b8fbfcc93149c48b5fab1b103374fd9
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jakspravnenapsa.cz/userfiles/file/4643024293.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/berunidinona.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///vunabezamiradojagozemip.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/piwudikes.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/35876493545.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/24555025062.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/16792195004.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/bawopo.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/96718132347.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/juguxovojosamedebiw.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/79887951614.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/29057501917.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/fifopufijerezipesuw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150bc98209d5.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec8c42bc6---mujuwamusoredog.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/73445266443.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e446368e1e---75817421838.pdfIn PDF document text
    • http://360global.ca/userfiles/file/rimamotamajibexifuv.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/17718653606.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/pifozuge.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/zuduluj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6a4606954e9e25600a310dca3a1a4c2e/73540881373.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/kapawikekowumopimevuki.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/mizuduvowiweranexime.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/45850636174.pdfIn PDF document text
    • http://evola.it/userfiles/files/38776484988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+watch+sports+for+free+on+firestickPDF 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_off0000b640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB640 10700 bytes
SHA-256: 6bd8cf8e587dee9e4958e25009bb951817d734d8d43bc145241620f062768461
font_01_sfnt_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 15616 bytes
SHA-256: 4afbfe864a7ac93cf86dc45e15d3772906d872f7fe263830f1cace0e98246d90
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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