Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21131c90e628cb4…

MALICIOUS

PDF

106.0 KB Created: 2021-08-10 13:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef1f9cd72282d7526ff7a4f12805b32e SHA-1: 510e4c3ebf932a6faa2cfae0be5068075a419652 SHA-256: b21131c90e628cb477d074a4f3e9cb03e891c8050442de3da4832114d449703c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of multiple compromised URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d30ac288a2b6e8cb28383fe3198fc700/34041839407.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef2e5d3ab---jopigasaduradu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdea81ca07---monotuginenazuneka.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621195406.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/witatitegit.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/93fbb1c9b0b784d1eefaaaf376d3daea/limir.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/d132e7a7e0fb0493ee2a508a0718a2f0/14956399508.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f55a74fb---nidevezebudidijusik.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/s1dvneme5gn7gghtm46nmlls61/lorufeju.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/49983846003.pdfIn PDF document text
    • https://inifd.london/uploads/file/vedukutegete.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/segib.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/58502366912.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0624231f76---7875269094.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/15074618401.pdfIn PDF document text
    • https://dalba.net/other_files/File/16008447119.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607302f743dd3---bimer.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b224c046ec1---94603672408.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bikokujesatix.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/57843762276.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jodugaras.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/oh87md2p7ramhihof6hg817gm4/74146981396.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef1eac6---gavizupasume.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ded7221a25928f943251418529a453c7/82793165819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=five+nights+at+freddy%27s+2+free+roam+unreal+engine+4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 11288 bytes
SHA-256: e230671c5b7b00dd1315c48a08a76ecd9ed8b6b2419c8fa6f0caf46147e94002
font_01_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E65 16316 bytes
SHA-256: 73ed0659ae882cb8a7d07976c1e8f3f8b82b3e7d8f6cbd3eb692f4b4f9f7e719
font_03_sfnt_off0001648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648F 19752 bytes
SHA-256: 805d4b95f79d5d02238b4cce2fe42899f0f65004f73a5c55b91da21b8e04a049

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