Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f7af29dba035a5…

MALICIOUS

PDF

93.8 KB Created: 2021-07-25 08:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6c531a0df00ea0b3910e9eb66ec18253 SHA-1: c3689696c46b04a6aa55df136c17739b60a12155 SHA-256: 39f7af29dba035a5666c44e09c21659b4743bc0222397a1a5c88a4ceb0486f00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/72858819910.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c8b30b142---38797997812.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/21775251406.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6dqta07n457npj89vr6p9u3nt2/lopexibapamosenolebofas.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/rodigavufapudomagogo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80842f6da---23590440545.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ep02i2aec0pnb4soabp2g08uqe/pedapavori.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/15033782980.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/nametirajeji.pdfIn PDF document text
    • https://nasikampung.info/contents//files/39494346489.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf24075cb---94682600171.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/73360684211.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ta3c5o6n41c5dobll1e0223hf3/xejuri.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/10c7ea7c28df49482c1c143317e0b999/kazufagekuzo.pdfIn PDF document text
    • http://mobilenmr.com/files/files/zofozivitobu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a9a14ce0166eb09bddfb7278babe498f/kaxunizewuxotigamidenawub.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/69528515595.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476a3b5f30---sowewetidusin.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/44291984157.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607564944f7cc---55704211050.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j0abcb53sekto5166rsmklgd22/89021716727.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160896e802d153---rexekojexaperipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+have+a+virtual+trivia+nightPDF 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_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 10464 bytes
SHA-256: 7578b5538d9b32aed5d4cadaa3078335ea70e38412241138c640aa8fd87fc6fc
font_02_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 18736 bytes
SHA-256: 665d9b871b65802fa9da36db80e14bcecbe4ca310a4832cd2e74dc11b9bacb0c

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