Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2240bd24a24c8b…

MALICIOUS

PDF

70.6 KB Created: 2021-05-30 15:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd28b892d28fbb0e1a4de771b8f43c6 SHA-1: f5ed6d2d40919ae88ad4dd9d299dabbd5d8382c0 SHA-256: ac2240bd24a24c8bf415a3d4bc3e8af630799d61f5abd3ccca1996f92e0391ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pixomot.ru/uplcv?utm_term=does+alice+and+olivia+run+small
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/89390d5b864145491a8f4734f0f83bed/sefubexiramakivozusowegep.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd47ab26d8---nenanijela.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/575d6ec820dd9592c8142a6e4cca9192/gunudereselulotinak.pdf
    • http://gorisum.net/fckeditor/upload_file/file/99585701281.pdf
    • http://nsdadventist.org/FCKData/file/52700019357.pdf
    • https://aimara-bg.com/userfiles/file/14548331892.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1c2ba2b2---befaduzesuk.pdf
    • http://booklandbooks.com/userfiles/file/susovitebupiladuz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k377hnugc8ejk1l8gdr6vqvnq5/zogugevisilibudazudo.pdf
    • https://chp-travel.ir/data/file/lalatekivinajumesa.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/8624326206.pdf
    • http://younewstoday.com/task/userimages/file/66904957294.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d7fc36f1c614e3df9969361fb0da042/zipiv.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ltrsnrb3ppv6aetbh7r326oul0/nedoxixurezin.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071858b699fa---tibobotuwiturujovufi.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8i30lrasc44h89u5iufdfcr5fc/30515527264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d207.bin
e7605ff62cef8aaae87df48ac72892c6c8cc507ee962e1bfc78fed2ccf2de882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 3932 bytes
font_01_sfnt_off0000dfd4.bin
0fb06d519f0d2cecbe2eec7999c8388d115baa2f9cea6dbbf4585fb30aa8f82d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 5144 bytes
font_02_sfnt_off0000f148.bin
1ceedb0791959b097ff77a7d8ce02a59aa0ed509ed93bf1fe626394af6bd8ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 10588 bytes

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