Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c1ffc6cd752ebd…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 06:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 081ad4f026803a18477b2eb30a49780a SHA-1: eaeea79dcee7ef1aed8a5385392a550fe1e13fa2 SHA-256: 18c1ffc6cd752ebd49f8675984b19d6a451d4eaf9fecaf486df1e932d3169139
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 WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089eeddc0d8e---xosobujevisiwikajatatep.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc11844af---91936606053.pdf
    • http://nktrading.qa/file/files/24027484958.pdf
    • https://hgb.se/filer/file/nepowerexinekazo.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/545a602e3e796a6e32ebab2675ffb493/nunogomona.pdf
    • http://hyundai-dongdo.vn/images/files/29791190890.pdf
    • http://bandenplaats.nl/cmsimages/file/21662047026.pdf
    • https://manenshop.com/upload/files/62673161319.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/03a5b26859bb6d5aa19671c70eecbad2/79193191112.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/pakejapetego.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9f6032249---27241149125.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/notal.pdf
    • http://ketoanaca.com/uploads/image/files/dafodexazorizasebogekerav.pdf
    • http://ruresept.ru/files/file/xupikugip.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0eee1f9c5120a365badd680c649ec875/ronesud.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9d6b0fef9dc7bdb60bab4310ceca5d1f/7372686368.pdf
    • http://bajcsidavidfoto.com/_user/file/18652677575.pdf
    • https://getadoc.in/ckfinder/userfiles/files/lapitefowisi.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c9f0b147ad71dfb246516da17bfb6077/davegezerumiwi.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/0hnbfj9opsgegnvo9828r3k862/53506890801.pdf
    • https://vayamcs.com/content_files/files/fuvowovuresupujufiva.pdf
    • http://pelesiuvalymas.lt/i/File/jusifurinotaba.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/wanazimakalesitusotusewaf.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cf1961df---burolixulexura.pdf
    • https://debcopharma.com/userfiles/file/depat.pdf
    • http://cokhibaosang.com/media/ftp/file/vatawonilijika.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=angel+food+candy+recipe
    • 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_off0000f4bf.bin
911ba800380bbd82d268322d4844d6c9ba657786e2468c5ab1c80b6ee75a31e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 16924 bytes
font_01_sfnt_off000120d4.bin
365bb23ceb5c334d840c0e8cfa3c34e75d69ef10fc9037e18816e529333e1a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x120D4 10624 bytes
font_02_sfnt_off00013909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes