Malicious PDF — malware analysis report

Static analysis result for SHA-256 a900d7c36179c3c2…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 04:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e158edd389ef3b4a1aa3f7203e09c5f SHA-1: 193e0a4d0ad42824b9e4b83882a6db8656375722 SHA-256: a900d7c36179c3c2ecc0af67b2317456db3d72cf2b624f445942181507baacca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=parabola+questions+pdf PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/fabab.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcee75610---76116353421.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/vipuxadozu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/29564811487.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/6652259628.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ffc8784---wazal.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4149ecedb5c7064d66ed7c32e43f9a84/76528290756.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/24430767536.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71f9664d---pizuwaxanoloxef.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fc369812c82aa1340903a4be66d562f5/luvatizopoz.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0c280d1bcb7427dd915819a20637305d/gofejobemepanuw.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/safibiwurupa.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/raxigixurozisolowezizu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb3eab1d7298898398543705bad3eddd/pizofan.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3f65eb315d2f4b973e65286bd4b35ea4/92271408295.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/73772829647.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96779277445.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/wajitupemokadigojowejidep.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/92385312606.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16095ad7cbd3d6---83761222232.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/58480229843.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/41951704786.pdfIn PDF document text
    • 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_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10880 bytes
SHA-256: abff6fcc82ccd83dac5810e90e7b3cc78be0462d6c42db730313733482d89433
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 19200 bytes
SHA-256: bc85efa6ad4fec9dac597d9e120f485cad9f80349f6ea22bf53e30f0a1c009ec
font_02_sfnt_off00014274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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