Malicious PDF — malware analysis report

Static analysis result for SHA-256 018fae4c7fdf1986…

MALICIOUS

PDF

93.7 KB Created: 2021-09-07 04:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b16fef7f67273ba615e27db7d7939ec SHA-1: ab43f3c69ae936466926e40726bc5cf49ff8c60b SHA-256: 018fae4c7fdf198692afd3324a78388006841f1e78490e89ed3fa76b0540d794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in URLs further supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=critical+theory+in+international+relations+pdf PDF link annotation
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/gegejafanipiteka.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/rokiwojazixapawapib.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/50840886662.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/52165704668.pdfIn PDF document text
    • https://agermag.ro/mm/file/xirapexumejazali.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1331d8b---lesivitenifafofewa.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/2500889705.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/17195581281.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dfd3b630---97016886576.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wefegikarika.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/fixinotogejazumuxogiti.pdfIn PDF document text
    • https://guijek.com/userfiles/file/tonuk.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608036f024117---bokisowegajozubode.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/lejatamepifofawube.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3512a46b---sidababowixabefetobijogib.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0802462b06701d3de8f1623962bce217/44312550999.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b1b05ffa92cd8c513dc03cf5fca7830a/kigonuwunik.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dbe3445e---totimedosigetutopazodike.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/76308180666.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vd36s7dqihbvgrhqn8kh4amcmo/1915529319.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/7009445833.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0df15c705---76767993952.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/ridadedujedeviwuran.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/69658ee017fbe36b3eaeb8a1829a4ee1/lowivakajesorazojenu.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_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 10864 bytes
SHA-256: c9eed3f07976075cd68320d9d4b0b95dbae31fb5dac7a617d678d91ca77d560b
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 18936 bytes
SHA-256: c0e3c495d92d2685799515a30c7cbdeb53ba91dbb273e542327ea15c0fd5d992
font_02_sfnt_off0001507c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1