Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d4320265466d37…

MALICIOUS

PDF

96.1 KB Created: 2021-09-03 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f4d32cf9e481dd92faa3d4837c9dd75 SHA-1: 985fcdbb37716e002128c66e75e224ce89155782 SHA-256: 17d4320265466d37f2e43e9bbf4d1e73b641d472e5d3a16214dca7d4c1e933f1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many distinct hosts with a single link each, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://xn--nmqu14inmf.com/upload/files/dinesexunumi.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f33a14b710b09d7a09d1eaff3aae8caa/kopuduva.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/681bad6bc095c4ff31f22cdf6df2fa5e/30508221168.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/51bb71c6a65fa655c80593910ee6b4ad/17715943117.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f736fea96c2---28830666444.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/vamikarusoki.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210816212203.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/15157542849.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/veledogimen.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///64974408818.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/ludenef.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/8110297891.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1981de4nnnmihpt61mkd9ced16/xekakajiged.pdfIn PDF document text
    • https://htchninc.com/d/files/kigiwalisegakonefa.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/87837413235.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/mavesewusa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/663418ee930b11f289ac2af0971f3dde/59138247452.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/jejakovunak.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d3f0ece---33022954623.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/sizodolamaleserikemupovi.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/54490098990.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/50365946975.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/svtjfd25h6ep571eak6mifo5g1/78426283808.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/fadofis.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/numikajetagiwefokobinug.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jupawujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hadith+book+in+bangla+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_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10600 bytes
SHA-256: 2acf04a57327949f44ce80b0ddd83b190193790585abe220cbc7435b510b1305
font_01_sfnt_off0001220d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1F 21588 bytes
SHA-256: e88cfd232534d22ef28f5a0cbe167029ca48be4d1e2e66b483f7dbf1ae9c035a

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