Malicious PDF — malware analysis report

Static analysis result for SHA-256 278476e7e0954942…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 23:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64fa406d2e42fe1cba538da58727268 SHA-1: 7ede27d84dd863b480a50967e22e62ac3fdfffa1 SHA-256: 278476e7e095494232b3761dab7c8495e3e056e9db08c0e38e328a4b063aaa82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of a link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2546b74d9d---6676215477.pdf
    • http://zae.me/datafiles/file/funujilaxurel.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70f32b6b1---55542263284.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e5b4a5bd4e7d3be6fc1166b009488ee6/mizibenidalilutupatu.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/savutavitezij.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/93141357993.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5hgslhett6nm91vtv6v11ei6g2/jururepizanupavegamod.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6b82407e09a9079cb536ee69d1bbfc96/susefetojojojuvalefomemen.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/suzowa.pdf
    • http://aarogyamedico.com/userfiles/file/50616221707.pdf
    • https://vestol.bg/files/file/7872793289.pdf
    • http://mega-stainlesssteel.com/uploads/image/files/44368496529.pdf
    • https://fanaf.com/article_ressources/file/60070084440.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c87441ffa---sasoviz.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6aaadae0a---76186061397.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/51611417210.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae04ea079---ditazemituriwabetakebewu.pdf
    • http://poorclarescork.ie/images/8618929361.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/60308247445.pdf
    • http://aucoindeshalles.fr/menu/file/fawufiketipefax.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/008bcba3396b814e544b91b181b600d4/lozerekimurajogigejozuxo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c5a084923---xibibatefogejadibizit.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6453bb091685c6ed7b1ff8a1f86294dc/labiwuji.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1d4472281cdf6c396ba03776cba8f828/33426167120.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b807146d04a---fasupepejemotis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=easy+sudoku+puzzles+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f309.bin
1469b03471cfb9079bd07d82e8fe53a3f3a51e7bfa01c953695dbbddac422e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10628 bytes
font_01_sfnt_off00010b99.bin
0f97954efd1f5332faf9670fd8038c5b5408d6fa94e422365c8dad2fb5e24ca0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 17240 bytes
font_02_sfnt_off0001389e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 16792 bytes