Malicious PDF — malware analysis report

Static analysis result for SHA-256 e366b76dc3501721…

MALICIOUS

PDF

83.0 KB Created: 2021-08-21 02:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d14ef0b1fac789be74c6c1088b8bd079 SHA-1: 9be178a9acf418ee8c5a3749dba3f88e2966bffa SHA-256: e366b76dc350172111f786a305eb8a83cc369a861c623c45b140d92115bb3ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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=saroja+telugu+movie+mp3+songs+free+download PDF link annotation
    • https://wegofa.com/userfiles/file/zuxagetobodozaxukudomo.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5q8hkbvh0i4qe6evcgkqkkiph0/47133050833.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/8973182126.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mifevirawipisewamu.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/zomewuvagisizamoti.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f20ffd1ea04---66821780966.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f44987bbe2---15146767470.pdfIn PDF document text
    • http://erpos.sk/data/files/82723740389.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/jumexanuvugugewokegik.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68e6e45710---58463028784.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cfb6506fa---widapot.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/lanebetilezafifatujam.pdfIn PDF document text
    • http://giwajib.com/ckfinder/userfiles/files/vawak.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcdd25c02---jolusipuge.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/losibavubo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/86364293811.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913f4f6b824---jifofelelajevizebebelal.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/98661762984.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e7cfa029f714628bc48016e386f1c59b/19184283806.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/jobafif.pdfIn PDF document text
    • http://tyextractor.com/d/files/jafasupa.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/kagikupetoponenifosega.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/nepotidezimopego.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cjib5vf3180cqkhmhkghbebur3/25834214001.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u786ul50luvau12ood56c8lvj4/lupuliju.pdfIn PDF document text
    • https://oliogalanis.com/file/winevugirixatovin.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16516 bytes
SHA-256: 63a2ce938e078505c1f88b90b974331bf35ac3ef60d073d91734112a43ae2e36
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 11472 bytes
SHA-256: 351209001fcd192b027da5652321ad9745975f99a8912ba688bade2702a62178