Malicious PDF — malware analysis report

Static analysis result for SHA-256 805a09a8807651d1…

MALICIOUS

PDF

98.0 KB Created: 2021-07-15 20:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8a989c04569fc2a0a0edd6011e7c6d4e SHA-1: 1275030c1d0c06d7f8eb06647f8c1f4c13e870dc SHA-256: 805a09a8807651d1d9576a9a045f5c7d39f36f583237ad7a73a7b61677ba80e0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting it's used to redirect users to phishing or malware-hosting pages. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://cructi.ru/uplcv?utm_term=chi+square+test+normal+distribution PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4adddbfe374a8da33d44195f336a1f3a/latolovolejilisolumaduzo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083974482c61---luruzabufavubudipelewidaf.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vakudafole.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/83202057098.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/87115735047.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf339dc5dd2---36174644381.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/46897659968.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da20cd88ac---deliguvelufuwepame.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/42523559833.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/giwenetoxexakabejumale.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/33891911476.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-5/20210605064759486431.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46a594cc0f---55333012653.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/21924408199.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/jagebizeveworineres.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/cd497b56e666d8c5f8a8647aec00946a/tovuvegowivexuzevubi.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/9275775814.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/245565133.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/22474084808.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mizedo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d573517657---30478010682.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/gubemogezopotor.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
    • http://voijin.com/userfiles/files/77800733160.pdfIn PDF document text
    • http://isvpro.com/custom/files/78203186164.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hm0fc7t9g4schqaionos45qbt7/93184396740.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10932 bytes
SHA-256: 5fb0053fec77565f24ed44f98246a7389edb5506f483812bb4b6f89013a4af64
font_01_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 17764 bytes
SHA-256: ebab64c0c51d95d62da23213d8127ea68d175255316d3d23abeacb033d1209ed
font_02_sfnt_off00016282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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