Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51508b48a0f0fba…

MALICIOUS

PDF

106.0 KB Created: 2021-06-26 08:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da887408a7791ab0b05e64df942beaee SHA-1: ef1cb886f35f5dd9c27a02bf1b61129071a2e466 SHA-256: b51508b48a0f0fba8164db2278ecf37f8a15aa465546dd37e99f7ae286f8c63c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms is a common tactic for phishing campaigns or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b8a0c68d---debibapirex.pdf In PDF document text
    • https://inncredel.com/uploads/wavupamufo.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/tadipoxisowug.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/19931479884.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49f5dc6f9---54693672507.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/7026796996.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d0223712454---36178235773.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/d5qrg3dsmsaq03dm3u7q6b1p16/wopekokiwofaberufe.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/287cd41a72dbf3c47171b2f4eea4a0f5/53849792881.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xamimezese.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0e7885f6---24680714895.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/namisolovixetaralo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ed71ba228366f52a7c4737b8e2c3a9b0/83092259985.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/79519162943.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/14171741487.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/33828088139.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a75d4020f53---jurofugarimanezeregu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/31006538944.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514161715_1357605771.pdfIn PDF document text
    • http://iviltra.lt/images/files/mekexowiretunewigupidax.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/83da4c38b6efd38737033db48ac6732e/limafulamabilutidokizutas.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701599c99d---gewifameke.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a9vv19dpvgc47db9b8li1usd6t/gizuwakatixoxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=write+a+program+to+print+the+day+of+the+week+using+switch+statement+in+javaPDF 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_off00013969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15180 11604 bytes
SHA-256: 44b652db0f6bc1a5fa8cb9a354d7d77317c151e5b1366e353afce58ca2e1f41c
font_02_sfnt_off00016cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CB8 17464 bytes
SHA-256: c5629396e930bcd6b62796ff9975152f509f60a143525fe25f69ece7a9d376f1

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