Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5e54aa501b9a08…

MALICIOUS

PDF

78.6 KB Created: 2021-08-13 16:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c88bb7e2939faba8269ce5324cdb0b5 SHA-1: 71beda242e1b83f1d7264d5edb505d9ffe2154ad SHA-256: ae5e54aa501b9a0892c79406b606db0cf63fd6d17d269b4f7cc7f11263a19003
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or hosting malicious files. The presence of multiple PDF link farm heuristics and a high ML score indicates a deliberate attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://aimic.com/userfiles/file/nutim.pdf
    • http://aitrans.cn/UploadFile/file/F1202106051815292175.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/35980195186.pdf
    • https://kaowei.tw/image/files/20210701_194632.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb3dc0d67---fexuxisamigotiv.pdf
    • http://resetimpianti.it/reset/public/file/27623183836.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v86rg5g5cncpt0bv58iedtp7h5/60224438866.pdf
    • https://bhsbeacon.com/FCKeditor/file/85047522580.pdf
    • http://lutechmed.com/Images_upload/files/66276974119.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/legitato.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ad83ff5---mipuriboletonavabe.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/58758732535.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/q9mnku4u3h4k72ag1p88oia8vh/gadezasalaxagoru.pdf
    • http://carszana.com/image/upload/File/54687398808.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073989ae4298---91224071001.pdf
    • http://luingpyrex.cz/foto/Image/file/52703340686.pdf
    • https://5udua.com/contents//files/85298193641.pdf
    • http://chothuexehochiminh.com/userfiles/file/42759563347.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fbd26a2d941a32c514998b950c90f73a/nuwadolegozupamusewojur.pdf
    • https://iohrp.org/f_files/files/lugezodugolamop.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/zoxexafasetat.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f155beb018---84157178475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+geometry+richard+rusczyk+pdf+download
    • 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_off0000cb8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 16792 bytes
font_01_sfnt_off0000e3a2.bin
8c7ba565e9d13b06bf22a5c42ef15d7c064420fd5aea179bd6b7ba89ede25a8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 11472 bytes
font_02_sfnt_off0000fe7f.bin
affb5b3909d809098fddb2f6e5356b4a42367e0e291ec9257707d3384df35cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 17612 bytes