Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03df23b91fab4c4…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 02:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fef8e0596c751876a5ba6b92320a6733 SHA-1: b24737038bd644987f71069274adee4a5c91d52b SHA-256: a03df23b91fab4c4333f26498bdbb6a2b6d288ae0305545f62ac33762a9a4de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa31029d6---66077671138.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716fdc0322d---50418074582.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/56597336813.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/30848060212.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4144e67b526ad129979be0edaada882f/39034699671.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfe64266e---tufafolawojawaduvimiz.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dodagatepebogakonuw.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1d2a388b---vusalu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/3275614000.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/333f23bb3c81abac8ef76de27c2b1b39/bazogulefaminujanuto.pdfIn PDF document text
    • http://vln.nl/files/file/linime.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7caaaa1f5c5acfc6f73432af8ff87d73/lemet.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/gatozakizusexakanagizewug.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210817/file/16291742528460.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/kewebanus.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e60bf14c85---likaripamolawo.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/dukizomoxi.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/18906648827.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091b913c269e---banuxenuw.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/vokojasipugusakitujanolu.pdfIn PDF document text
    • http://birminghamseaholmclass63.com/clients/75362/File/70899365184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nehalem+microarchitecture+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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 19680 bytes
SHA-256: a31d8381a9e0b9f2947088c868731136630d8d607bc5c74d36a2e67bfa31c46e
font_01_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3C 10688 bytes
SHA-256: a793b70586dc4a296a98ef2f161eed61d627d716ff14a0827ad3c7be0b16993b

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