Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d4d11504892333…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 08:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad7b1ebda4cef36c221de20f5c041f6a SHA-1: 66a4c971745dfaf61de0eeed9a4e2bc5c805fcfa SHA-256: b1d4d11504892333a0b1b99c3998f38d7a34c88c642ee3791936d236aa17d7ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL distribution suggest a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=the+internet+of+things+pdf+download PDF link annotation
    • https://dogathermalhotel.com/resimler/files/xoladipokom.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8051160540.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/denuxak.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5caf97347---womejiki.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gakunuvafafirawit.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/76061810703.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c27bebee806---4558332344.pdfIn PDF document text
    • https://agatanorek.com/files/file/zasofofenuzif.pdfIn PDF document text
    • https://bloomeng.com/uploads/venumebexumefewajobipabu.pdfIn PDF document text
    • https://premium-house.uz/images/file/xixafa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/31343330e768328fe4472f8fd23b15ea/xizif.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e2c7955c---zumizuxizuruduvimo.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/38514997337.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lezologiwaponiz.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/pumasumijine.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/8146696482.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/40664c09eea1bb5bebcebe2d668176e1/xivoxax.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d884c3f9c83859a63d1e9ae54ce800d3/31965829253.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/58599520612.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/rematenikanerebo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e38b193e464---12239604346.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_off0000c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 10828 bytes
SHA-256: 027427ce70c2db35314f58e0aa15967859fcacac24711b6e08da991624e5f73f
font_02_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 17560 bytes
SHA-256: 753d5d459f90b7a54423942a62fd6e9bf911837ec1c9d054a3ae96ebcb0b0eed

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