Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b3cf9fff6c283a…

MALICIOUS

PDF

85.5 KB Created: 2021-07-04 07:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 618d2a39338e400b288023e1cb4f8aef SHA-1: e6d52cc436f01fd79084994ec98d7a25a8fc7581 SHA-256: 36b3cf9fff6c283a8ed2afb7697eb26077cdb82d4a3dff0f1ab04f2a35eeebcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kochamsushi.pl/UserFiles/file/81215547873.pdf
    • http://gourmethousemacau.com/UploadFilesfile///firemidikijexilarodupewis.pdf
    • http://simkoongschool.com/uploads/editer/files/sapipebuwadadorewakim.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zegosuwi.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a826667bd---51559553897.pdf
    • http://kyanite.tv/userfiles/file/66651345234.pdf
    • https://lawina-radom.pl/files/file/36504125410.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0d61260efb591f5344bc57865d4aa761/loximezenavifanizafikusu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1963576067---72867839769.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/37d897b39cd4ab8bf19eda0e9f81e9cf/sakakaravoginekafapoga.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35227fb7bdb05fb72eec85e86063adc6/titokeguxifaruzak.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbed97aee3---bonarozixobibene.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094770b0f62c---sepazemisedomuvafawes.pdf
    • https://angelsstaff.com/uploads/file/lulodemekadu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0226f37a40---xopilovagopiboxi.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c1e6401b193450d9e67db2f3d3dbbe10/jodazelevilamojeragi.pdf
    • http://abc-tel.ru/data/File/loberelawafazodafupabuxor.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9c77f019ce2c81626ed0c837702c5a5a/51984909483.pdf
    • https://xanbiente.de/userfiles/file/24097278146.pdf
    • http://transsnabstroy.com/userfiles/file/74366185871.pdf
    • http://1utilaje.ro/mm/file/zukomojifitevagata.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/86mn568bvi4s6renskt21ji97v/rejopanudibozoropelado.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/39120552731.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8sl6su0vkhgk2321q34tpc89v1/29044182419.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=iit+jam+2020+biotechnology+question+paper
    • 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_off0000e416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 16792 bytes
font_01_sfnt_off0000fc2d.bin
59c7d69025f2631157e6cad319fc5c8d69ba187f417be072a18cc475ccfeacc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11644 bytes
font_02_sfnt_off0001172e.bin
24c6133e4c9112f8b93590104ed40f2837267ceb00abe9d15a53374a00b2681f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 17908 bytes