Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ad7188d17b28d6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-06 22:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9f776a270ff8456c296e350b78e44731 SHA-1: cf29acf4a6b5d97bfa3c1a859635d25231f15a19 SHA-256: a5ad7188d17b28d6d21601b244015280fd0050f349099a03ef6e2182148fe57f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100aeee4eeeb---vazesirufu.pdf In PDF document text
    • http://lagrupacio.cat/file/bebowiruxejovozupizi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607120c63dc7f---megopegofogek.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c149e332d59c26db15f6c807d59ae97c/furevix.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108120349015973.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608386ab82b51---fumuginasozokodapewesik.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f138b4b05---61211806260.pdfIn PDF document text
    • http://mp-journal.com/media/file/sebug.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_429B0CC0E9EE0DD9.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/57532989597.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9865308d68---tinasujuxus.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7f4ec491fb19c008b71d4232646f0a3c/rajupunowesup.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/lalimegazuboxokuzuxupid.pdfIn PDF document text
    • http://momsystem.ru/public/file/telawaxo.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/56fe5e15f9d068f256d142deb00064d4/35880561284.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/48030898931.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a8b6f56d6498a5c67edd2c838631bf99/83212655914.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/4897569201.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc87fd5285---14816365967.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7da51b3774---47544182573.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/76281042510.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kebakunani.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609673b839de5---salomuzejeziwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=english+vocabulary+test+advanced+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_off0000becf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECF 17016 bytes
SHA-256: d06f1a41e924ac81c86f46f4d3dee9fd8bae6be0fd0d67eab73128d9c783380d
font_01_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 11304 bytes
SHA-256: b64edb0b753a10a7be9d23e33caac1625562a8a38b3f2626303c90cee77d0995

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