Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d3d73445d0d258…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 721c90354f6e33217f22469085ed6f5c SHA-1: 93dcbbcf70a8d218fc0f8c2803e02ed773a0f469 SHA-256: 64d3d73445d0d2580fa3113ace93b11c41ab97f95f4ec3cc7e0714cfa471b89e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely to distribute further malware or phish users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5200a80e---berimunudutonusap.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fub6lbd00kgnksn9esvbsod159/podinirixemodu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/vasekadefodusesodojiw.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7477161dca---66756845356.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/roxojawonaduxorizumo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd844c9da3---39702461867.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/96850039513.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/57252834414.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/56723953574.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/40547658164.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2c1ef55e---pasibebe.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/79983365062.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/sopijavijaxirutimufinut.pdfIn PDF document text
    • http://www.grifin.sk/files/xiwupukikadapojatufas.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/39883583199.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/78676457738.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zabexonu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7f748266e57fc27dd36d7c925135e530/zaketoripajeb.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3c2b88634---28944220059.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/30502796263.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6917a868---35017626420.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/sutuviwoxalekaja.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/brp5qjhft6hknq01064ai8h9l1/mititasales.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/texanovopudibiradolu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/98574395429.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afc35daeced---fomiparugulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pit+boss+classic+pellet+grill+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 17172 bytes
SHA-256: b45e85471dc2c368118bdf316bfa226d6edc57442c5549c0a65267f6070a54a8
font_01_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 10960 bytes
SHA-256: 18c125e50caae1dd6f71c2b4436b5fb2d5b84d325a0d2632df289f2d2867fa71