Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b29d6f0f3d85177…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 06:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe23758c0b16693bd0683d0dc6e5d6db SHA-1: 9536668a5e41745055e202b9d3cc01f29f83ba6a SHA-256: 8b29d6f0f3d85177d886a3f1eae1ffd6f2f156624f01522cae5d55179fd12f67
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final destination and potentially distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://etasystem.net/userfiles/files/36793666510.pdf In PDF document text
    • https://kolegium.inaheart.org/upload/files/27065941145.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/37942059527.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/21/1228899841.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/kitax.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141944f20578---55283022018.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/kuninef.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/roladiwewadanufa.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/33352712343.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/94705347665.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/10812544390.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/51559286860.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/68674694014.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109200001343652.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dd5fbcf35---dafopav.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/88469451665.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/83192739508.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/94642877076.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/88632726050.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/bajatolewasafomilanix.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/jozujugidexarilutejizebo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/46693550202.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/tatimapisivodorumaxos.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/99e48b5ac6dd36f4b6f84db397f61a98/bodurojurev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=install+score+heroPDF 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_off0000ae4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 10184 bytes
SHA-256: 9b05520c91db72234088a099a1c0b09067f2d1416b3678421bcfba4c1bca828b
font_01_sfnt_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 14660 bytes
SHA-256: 1486a272489f0624d594cfe5c48c3198c3d583769a8962b6c47e49d70de5052d

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