Malicious PDF — malware analysis report

Static analysis result for SHA-256 55222f59e8559c6e…

MALICIOUS

PDF

85.9 KB Created: 2021-06-28 06:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 805e7fc6ac97eee5a02b67b4a73b382f SHA-1: 6510470729b055c2a72588c90cccfce12d12705d SHA-256: 55222f59e8559c6e3ffce07bb00d51a2f4aa25b088b291b327f51ef664ab8146
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links redirect to other PDF files, indicating a multi-stage redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/67bbfecc449e631893bbbb4a31d309bb/memapobeguzufipamojux.pdf In PDF document text
    • http://limoride.net/gallery/file/jetovegenigoxewiropaguxox.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/26c24771e0fd8369703d541e67d09682/palirudololamigazewod.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210617/file/16238876004254.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/peluxajoluderadubuzus.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab661c984d6---viwag.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab26de27646---fididazusidebufedude.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a510329---92958466720.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/82119982940.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/lizerevalukanufej.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4f973c7f3dc4b281267eb4dc59446fde/48554927770.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rinitira.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527f8438c1---tegifopenulirujokeb.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21357788770.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/bupizewuwuzarerif.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aed35cca814---zasomoliduxudo.pdfIn PDF document text
    • https://bloomeng.com/uploads/89478200104.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/13942194259.pdfIn PDF document text
    • http://alkanboya.com/files/file///17618141696.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b3f807bdb---9389848318.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/75c60e632063a57e27f418196e0b00e6/mujoxujevazelij.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092719f91845---49509178421.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9a22c5f9132d24158506d7d48fe0b73a/rafad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cheswick+homes+for+salePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10608 bytes
SHA-256: c1f65f0ee0b86978b2b5b0cb5f3a307eb21332c07b7777f8374f4cced34154f2
font_01_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 17924 bytes
SHA-256: 51b02e3185e1cc22370ae6c4f036540a6ef8f88f7f7a89069a501e7658eeeaf6
font_02_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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