Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8db79609a8ae31d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 14:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f49ad38b2a9e42b38062304bdfc4da SHA-1: 3304ca81fa8ac003bb053544e30d2e783627f4c8 SHA-256: d8db79609a8ae31de88efa1cc8ea2ca48c2b81dbf120b14c590bd1df3447e326
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting through the linked sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://catamma.ru/uplcv?utm_term=using+articles+a+an+the+worksheets PDF link annotation
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/b16u09gs81vmrjtj14nd9dg86m/lelokejamugiripima.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/k319sm35r34ieldfinvbqb5d22/sikesiwumat.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/49646728044.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060318552498.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/72190067527.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39333844134.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lnba4spcdquq7m3rffgilqs9g5/towokomematej.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qdl7l1lv7vblvmgnp058q6ov85/bugobunobevilozagozobeko.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/joderuruvapafadawajo.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/zokawuborukobesirel.pdfIn PDF document text
    • https://wittnebel.dk/file/buwofafagoz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ae2f25b---dexizajomufabaxoja.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/42897221071.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/250224548867.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/51521212213.pdfIn PDF document text
    • https://fallsplat.se/file/jamiv.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/58743723933.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607819d27128a---nijinusorezawul.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55c2d6dfe---77257105232.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/21143855899.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/da5c9b8e86b236b0a6df73ccd12fcda2/82862572001.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/66663018953.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/kapinojerosirijefudinu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ba178210---98887104883.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121a0681e51a---kavuzilosugoguvogobudavu.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 2644 bytes
SHA-256: 1055cb7e31e14aefb1489d496b6827e30556b87c764d0037b530e44aea25f272
font_01_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10692 bytes
SHA-256: 45d169dee5c9856197ed6bc7934d073a7d876ee1829b53d00bade5065c72731d
font_02_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 17700 bytes
SHA-256: 18993dfe71c9da68c481891d83f63245ab411e2c65e00b6a3e32642e6dee695f

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