Malicious PDF — malware analysis report

Static analysis result for SHA-256 297bb0edc7e86106…

MALICIOUS

PDF

96.2 KB Created: 2021-07-06 04:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5ef7891bd5d719b4f3c8322f89cce51b SHA-1: 2fb8fd2e694d8616c67fcd4383473ad7f5853828 SHA-256: 297bb0edc7e86106f3a3e7f07da71eddac55f3b2262becf38b15633f45c57c2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=freezing+cooked+brisket PDF link annotation
    • http://iglozawiercie.pl/zdjecia/file/27930880886.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-7/20210507131300298719.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a037e9a7---pazeboxetipugejosuxume.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_9CADA74E289161E7.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/38265516463.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/peremudepadenedutunej.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uekqrp13v5cfpvf54b61pnplqj/sosora.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/96895765767.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc43830cfe---foxitajiligupu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/revotoburi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/njc5qqotkh5765l8h9o4kn2gq7/44777428029.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f8d1819ec---56673197546.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/mizasavas.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5dbadbea40317b32f12cab743e9e7f4b/33646111534.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c526f8d618e---vuwonekijegamogalalisa.pdfIn PDF document text
    • https://isosklo.cz./uploads/64348048162.pdfIn PDF document text
    • http://weingut-suppan.at/files/guxuxonaxejemerutelofo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5bb59c9d---70722203115.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb7d7c330---2844467278.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/95aaaf8b585373ea704bde6841cbee95/loxeloxovagutewatizovi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe7b5a61---sudepimuxelufonifobip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001184e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 10608 bytes
SHA-256: cd664f79b872a80bb1579a4e179e9b7ddffffcd8f00e6e18357c88706ce09fc2
font_02_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 16872 bytes
SHA-256: bebb96a16e82be5194e0cee111e9f8a9d763fd0d8ef4f9c6a6da7f6a343b1106

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