Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5bf42edc08eb7f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 17:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8d28dec79d66062c7886ea23a14093a SHA-1: 9b2a2022ed7c748c0663d7cd7a31c20e6f3101e7 SHA-256: 5e5bf42edc08eb7f8a178e6fe750befc6d79ee51cd63163858559cad4031dfb7
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised or suspicious links points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gr-chem.com/upload/files/palanofa.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/soritapizupidikefofulo.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e1f75807---biradazuwexaxi.pdf
    • http://branpc.in/ckfinder/userfiles/files/dixifodemavigapiwotaja.pdf
    • http://aktifbant.com/resimler/files/wazinon.pdf
    • http://kurdumovldpr.ru/uploads/files/95690257408.pdf
    • https://www.gico.ge/ckfinder/userfiles/files/ruwasufoguforif.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a454b99c80---kamuxedaferej.pdf
    • http://hzdsbg.com/uploadfile/1621405790.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f13c9755211---2236821703.pdf
    • http://genbreedpublisher.com/files/upfiles/file/64685529339.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/gosumegopakizizufojizo.pdf
    • http://parfumerieindex.nl/images/uploads/53571839529.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/sopuxilakibezutuzazidata.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/1788f914a8b24834575e475edb9cd40b/bamoruzefigepa.pdf
    • https://telewebmarketing.com/FCKeditor/file/86057247445.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/67f1703c6480d40db4cc2a40bd9c558a/rukamak.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c516730268---piliwefogipefijokudazitud.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/ke8l1dftqqd5h5hr6omsjd4qen/sopelapomalo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4dab1021---41024961191.pdf
    • https://supermagnum-bg.com/userfiles/file/99541610449.pdf
    • http://ormansagszive.hu/upload/file/82059986640.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3dbabe249---gavuvaneme.pdf
    • https://realxenon.ru/uploads/files/mezelokefoker.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=let%27s+hope+for+the+best
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ac.bin
15eb30e50d219a91f03004e6b02bf975f89f906f8f0d73d63ff150ebcac0cf44
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 10180 bytes
font_01_sfnt_off0000f970.bin
502d109c97be0233e666105314a1e3d48cbe9bf4dad72f5875ce8d8ac0d832cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 18664 bytes
font_02_sfnt_off0001297b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 16792 bytes