Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6e38dab9686e91…

MALICIOUS

PDF

99.2 KB Created: 2021-07-06 16:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b63e1c6be52f37ad7284b4b867752f95 SHA-1: 6c38913c199733e0b4efd4b60dffb380ea84875f SHA-256: 3f6e38dab9686e9120a4bd76272d321f7c1e6ebcc8c7851e7a68b85a7e41ed51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0sg96akbutgsvrtoqjh3nmceh3/nugelotudidokigusado.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jaqt8aod429u453kkogd93ph0t/lunekatenumetosasof.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8bc0203c03db861374e539fb2140ee4f/85064546407.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160914aa906179---lajuni.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/weminaginipigamojuxe.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/takudelubob.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f665db89d2---nebir.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160903d6fb132d---5932586549.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2a3bf7a015e5ed967775dc96be3a71a7/14442608782.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/astl8qq1nds33j6nidgmr4ai41/35206442952.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sm8thbs1c0mbcerogf954ja6v0/20933278371.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/24638285729.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/zibasakedukatezavuranavi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1062b780634b39f15e30607025c42c79/sifex.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ca65333d---wekowawi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ijjgeq8eh4tlphuj1b9mdqrtt5/kitevuwutugagux.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/08f0a3e24b6a0ca1ac5f9b5edf35f4b7/86177115073.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26dcb1b50---xifetagixaxidiginiluvuv.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160968c97e8431---nokedigufipediwase.pdfIn PDF document text
    • http://prestopc.it/upload/file/21173150165.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/tuluvitejogibugosa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4de650976a27068e7b2850a5dd872bfc/nidura.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0e3f66081aa72f12c251215b0c867890/nonokub.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c22d141cf---baliwelizotixif.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/79790b449528bcbb1fb801af467129ab/mamifiwogitexowonitizajuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=accountancy+financial+accounting+part+1+pdfPDF 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_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 17160 bytes
SHA-256: 7072fa0942b744a9d3a26bd5f7806936ae9ba6e7e7ed9bc0b560cdd3d2504829
font_01_sfnt_off00014e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16683 10744 bytes
SHA-256: 2f8d64fec3be0e83f820e64af557c27b15889a9a5ac1718df4ff449860780881

Open this report in the interactive analyzer, or submit your own file for analysis.