Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b4c0827c7ffc30…

MALICIOUS

PDF

99.4 KB Created: 2021-07-15 16:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eab8d53422529a2805de7f8d20fc12e6 SHA-1: b115e871112329384d46d42676ceb6383b181caa SHA-256: 10b4c0827c7ffc3057e8d49da98789f396997d41a0a461612ec17ef25ce56dde
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains numerous external URIs and links to compromised CMS upload storage and disposable hosting, indicating it functions as a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of many links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=meaning+of+the+phrase+set+off
    • http://automsystem.com/UploadFile/file/20210701202209994.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803ae4de7cc---38655448688.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbd0c8538---jodaxow.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a32e80fd02247d855ad626a726b5a680/25803990682.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0t8g27k1mhjbv1cm996kbral44/45760033274.pdf
    • https://fsreloading.com/userfiles/files/sijumoxazezozunekawevu.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/letewe.pdf
    • https://maychieuvinh.vn/upload/files/26415650737.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/redog.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad878a22dc1---mitavadogegi.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd204453c7---78803135482.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cf7a7cbec---jonusup.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726e8643d3d---46948029566.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/loeaa31rp6khumk1s7335hnd4p/76731167307.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/648fe07d49ab63daa413359c39416f3e/pefigapovefij.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c24d2a7c262---71484766822.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210621_0F57A5F475C84B13.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213917e157---vozegevepi.pdf
    • http://smn68.com/clients/75339/File/lajubofubo.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3a2219f7---fojogutezutosed.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160adad2d28a67---46523992873.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001497d.bin
98fad700b2b2dfa36fb96b5a1d0b3eef4ce4e40df59b8873494a09d448fb1b8f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1497D 18420 bytes
font_00_sfnt_off0000e98b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 16792 bytes
font_01_sfnt_off00010198.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 3464 bytes
font_02_sfnt_off00010f13.bin
1aa9d240070cf06b6fc73cda93b9dd5fbe95e37456953018be094ee6e2b0f7a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 24004 bytes
font_04_sfnt_off0001677d.bin
4366b6a62a117b497f6dc104e842af76aeb73077a4b711cf180dcaed75d480c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1677D 10584 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.