Malicious PDF — malware analysis report

Static analysis result for SHA-256 4779f1ab3e267224…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 00:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a6d918d38a8a272a361e8721753ae077 SHA-1: 2f7f09c55a96c3603d2717b3eb189468829d8686 SHA-256: 4779f1ab3e267224439bf25de2ab613aab254d62dd66b85de03701eee4ffcdd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on potentially compromised CMS upload directories points to an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://galettedesrois.hu/userfiles/file/gamufuvesuku.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zepepoxab.pdfIn PDF document text
    • https://press-centr.com/images/file/bemiketikarufikil.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/nexibodogiridi.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/10092930820.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/modafal.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/cb86168f586ed53bd636a03c911ed15a/fetekonemotixadudi.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/65ad19c6fe00ccaa041777bc3b2b496c/34118101214.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e2a1b5e610e436f16289cdcc48a32072/35767641959.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/57d681011ea02b0ddae3d784e2b615b7/28568237136.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bc6b098934af5c7f37fd272f6c6763e3/kexudasureniwagor.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed171d3d85---javedogologis.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a8f912d2e04507774f874dba5b49203c/lojuwilujolipix.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/61565997380.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cfe779f1a338a2499770f1d658c2a26/wetuzizuraxaledezeribud.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/velugumevo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ada91baa---13336516486.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0057c587---tukiwabum.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/japukelogumozaw.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a12f52e9962---tofik.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/tilagegeseburewewuxenija.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7bca3662---3554905737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=spined+soldier+bugPDF 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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 10620 bytes
SHA-256: 8ec60d6e86bc193039e34fe907ab871373e139a23d5b2283364d2e4d20cc7573
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 17140 bytes
SHA-256: b3e34253c16e6405897620e86699522f8d34f6de3670fc47334e4bb382520768
font_02_sfnt_off00012f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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