Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd08628838847fa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 18:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9743c13bf8a6d0102e551ba3a498f0cf SHA-1: 9d46b9e6160c2a8ee6e838afaee8d0b5e078bc79 SHA-256: bdd08628838847fa1b084220cc7fdcda99da9f9ed77de901bc0528abf31312a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution campaign. It contains numerous links to external PDF files hosted on compromised websites and disposable domains, suggesting an attempt to lure users into downloading further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mavibusiness.it/file/9456237426.pdf In PDF document text
    • http://jujucuisine.com/userfiles/file/71825141935.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/60274843436.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9bc85892797bcab142ea81daee287d6f/28974406311.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/lufagekilevaxukupivoduf.pdfIn PDF document text
    • http://fabtur.ru/upload/files/73193081463.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/22285686099.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d4454c161---lenomavowixijasi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b8a14bcdb---danifunimubaguvigarere.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/50684795030.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/zavimemefodunipadin.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jugeguxofemonawubotibiruk.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c7913d3db45a9053fb0f1ea7410911dc/44621858281.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/94627965501.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/wusurugebetesojumi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/90823773080.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/85519120490.pdfIn PDF document text
    • http://kaies.net/upfiles/2109011318366813307pfxb9.pdfIn PDF document text
    • http://vinmexindia.com/uploads/33925184088.pdfIn PDF document text
    • http://osayit.com/images/file/vemezej.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jusavoporerilaw.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3dc0983f3f5e1fb144393d6a286f1ea8/2216998354.pdfIn PDF document text
    • http://dsagco.com/Upload/file/wivoxaxufetogid.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/kulakixosemajomefoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fast+video+downloader+for+androidPDF 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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 17692 bytes
SHA-256: 4ea9c1346016cae9a9b05aa568509c7fab7771631a227c9762c34ffc7a03031e
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10476 bytes
SHA-256: d3d3fa942491565d936b3fc40c35b00fea72d259bc1092b94ffc2b92d87b5b7d

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