Malicious PDF — malware analysis report

Static analysis result for SHA-256 c897e91531a6f249…

MALICIOUS

PDF

94.1 KB Created: 2021-07-15 22:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 028ce8e60d9887410ca4511828876ee6 SHA-1: ababf89a8a0229d1d3bf648ebf4295958a168143 SHA-256: c897e91531a6f2495c02084b0e6e38acf7056729025d9c8f50bf362734f74df2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://oniceh.ru/uplcv?utm_term=meaning+of+the+word+acolyte PDF link annotation
    • http://ranahytta.com/ckfinder/userfiles/files/3302443343.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105180056134086406wgiik.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106751bbe0---zogekog.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a050eeb536a---gosun.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/mijikexasidimavil.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/83cc25433e720c0c42e88161a0112805/superesitilazi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bl6gqub54245es0gev7sp9m6tk/1441928838.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d61b917802dd0f54c4cb36a122ae33c0/73390793221.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077c691bbb91---84160620300.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/xugakiweberulemo.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/69497177830.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/480ad0ecd3751f9b99a1dea8d9001350/saxeluzuxat.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gfkgma5n6o179ci4p6iinf342b/73681745353.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/viragapagonivuferize.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b22d81a94b7d736322b79f97e9999a89/neparezakujawaveze.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/gikagafowagoku.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/izaraxosirokediwekesa.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/74929650470.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/6063072735.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160877ba3e4daf---kebapulupetus.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac5c71821---pafunazepukaku.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/82990412207.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/zobimidikalo.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/bowifipewutinoruga.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4082402733---vafukar.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_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 10780 bytes
SHA-256: 3c67ac98bc6184f7fa85aafa067ff9171b255c6a51ee3bacdbe3888d406c8b70
font_01_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 17168 bytes
SHA-256: d68d7eb1307fa127d77f56803d85d059a4db61e5f9591ace5a8ec857d930e5fc
font_02_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1