Malicious PDF — malware analysis report

Static analysis result for SHA-256 28500a606ef4a258…

MALICIOUS

PDF

87.6 KB Created: 2021-08-02 19:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f872e2711b533f52f698eb875828414 SHA-1: b11a2405a3cf82a0cd70ec2f8a7c56720294eb06 SHA-256: 28500a606ef4a25898a9f9948625397a703fbfb2329d6c08d0acd44c4d52a8db
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URLs and the high confidence verdict point to a malicious intent to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=error+code+103+14019 PDF link annotation
    • http://agrion.org/upload/fichier/99782762666.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/b8faf73f747124e67d789a0c738c0ab1/29297544384.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c9f52a0c---depofekemomawitosifufat.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7e5099e457d0c192b649ffa65ed52d61/salesemufola.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/47349570858.pdfIn PDF document text
    • http://torgoborud.org/images/file/46567913551.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf8eca9b0---fiboruwonozifejamid.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c03c7b0256d7cf8236f3ec7175eccfdf/gotuxube.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/73162867447.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/bonukuvedutazebogewozij.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/94611130654.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/bakaduzo.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/76334675904.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/nokek.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/07345f909d6126c812ccc588b2eac748/12209056050.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/xubame.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/77852348552.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607202892bf3b---nonakawajigapowipakab.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076cef6457a9---wosimanowetigoroji.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/lazuzewowojetoriruwif.pdfIn PDF document text
    • http://poorclarescork.ie/images/gawebil.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/f7558610efbc82778e697fbbfc95b124/mofewawomazuxik.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d07f45be957---56522786033.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3847f7d327---purifoloraxolaniderivir.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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16936 bytes
SHA-256: dd12b602e97088f53cf559ca85072884391e4d5881c9f7cdfc53e47ba74f0a7d
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 10268 bytes
SHA-256: b495ec880f55bf07e2048bb362c2b77fd00e672fc6043b2468bf898198fb0300

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