Malicious PDF — malware analysis report

Static analysis result for SHA-256 11deed8917525428…

MALICIOUS

PDF

102.9 KB Created: 2021-09-06 06:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c44c27a7b225e3a2533033cdca6a2ce SHA-1: 68b836580a59edaecc410496a121a35f66ecae55 SHA-256: 11deed89175254280f6abbe53ebfee035ac0c5388177c2a36b7656f2372b4659
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://wastran.ru/uplcv?utm_term=basic+electronic+components+and+their+symbols+pdf PDF link annotation
    • http://gptools.net/userfiles/file/25739507534.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b2ad2f6f3e8008e34cdbb21426136c81/17964667348.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126b131e7ab3---punivoxemekuzeviden.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/31801879666.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c592f92254683fc325a9482747cab189/tufijorud.pdfIn PDF document text
    • http://newcityhk.com/userfiles/11238554068.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rakup.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/finumigunixilowozinuzo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a225b96b5ee---tidudivukadesapi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4081870719.pdfIn PDF document text
    • http://calisnt.com/uploads/files/6218176362.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a617a87341d---litofugesafeles.pdfIn PDF document text
    • http://talleresjpg.es/img/file/pubixi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15ddded44---dafujim.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c50de889fdae2ca47fdc64aab3b9e181/19132314688.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/63382660759.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///4534484632.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/18912982853.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d9a573f70---71464380509.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088adf0b206c---pirujotu.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pumesatupapu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a292bf0562d---binejuri.pdfIn PDF document text
    • http://axwelindia.com/uploads/25682351241.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 11192 bytes
SHA-256: 4c4a6a61aea23804394af3a41ffc5c6491c498786b35bfda9e377ebd954b302b
font_01_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 17516 bytes
SHA-256: 4630a449d7d0c625816fee0b4cbf1df9729391add86d985a6277232d85fd15aa
font_02_sfnt_off000175b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1