Malicious PDF — malware analysis report

Static analysis result for SHA-256 441eec753eb82acd…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 14:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa2b5986fe336c61b849f1d6e49213b SHA-1: 31024ce9c6c93c7355ca778b5e03e41d53bd384c SHA-256: 441eec753eb82acd8a02de60f61fcefcd49ed75f5480ad5b80fbc1236d76db0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://infrive.ru/uplcv?utm_term=askep+dermatitis+atopik+pdf
    • http://cattaneoarchitetti.it/userfiles/files/49774450287.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7f135dde346583f1a63c3e8693014744/womewafitepe.pdf
    • http://hum-lucknow.org/test/fckeditor/file/popasokajutuniziwavikoze.pdf
    • https://aspirans.com/files/file/kunomeratimolabokajugus.pdf
    • http://www.hangmandigital.com/files/file/tikimodaluzujejodate.pdf
    • http://epwuae.com/userfiles/file/vopekajinidusonov.pdf
    • http://saaretravel.ee/images/file/xirerejowiraluposururida.pdf
    • https://mimpishiosatu.com/contents//files/xanewonawe.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/lelotazowerubesuju.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa6a3f58---7914405323.pdf
    • https://infiniteprospects.com/FCKeditor/file/39351841392.pdf
    • http://citescolairedeledit.com/include/file/31618667967.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/07e05ccffcb409bc257492c040985e43/61160913289.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/8tdejde3septrsl9h80cn5vnak/bevax.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b00b7aa2ac9212fd7b211a280c3a86cc/99488294439.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c731106d8---konukarubaxafawipagiwu.pdf
    • http://inse.us/uploads/images//files/nodomumeveluda.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f8f10781b---13781132534.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c6de8a5f424---kizuveni.pdf
    • http://firegallery.ru/img/upload/nujizosudokawonezar.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/p2ecm35iq2po1fqcmlh86padc6/kovarezagasagowij.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/7bse4c1kcck3q4fsje9qa63pm1/81890466147.pdf
    • http://utpcomp.ru/uploads/files/61531280962.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a581da25f10952192ae2fc9011d91fe5/36564287231.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/papilorofojipokoguji.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162247794836.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 16792 bytes
font_01_sfnt_off0000d7c4.bin
c45ee4ccf893a59558fbbf364df4ec0605bba25fa279390229bfa10d664e2670
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 10580 bytes
font_02_sfnt_off0000f003.bin
2b3e54e84f122e3585346893a0ffe4f17d3e8c62acf2f941b9e078176cc95d07
pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 15804 bytes