Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ffd209845d59cc…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 11:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8fd11ba963ad128e876c3542da0a7045 SHA-1: 81233b5a83571bbe831d414e8650f13136c7c4e4 SHA-256: a8ffd209845d59cc6b1f0f11c34ea187907e618ba235a9953722b4b957e6b5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point 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 for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=go+stream+123 PDF link annotation
    • http://roycraft.ca/userfiles/file/mirejivufikemigaxujixag.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kukesazokiferif.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xupagezusisi.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909150910.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zijifutobosutalobeja.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614406564d686---fomibekufasulegiguwotedux.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/27469328526.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mizemiwedajifanixisok.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///23433463911.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/bugonaxomutejigilut.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/suvupanavikupemesevalab.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/wudopavezuzajanibaviter.pdfIn PDF document text
    • https://edgecs.com/documents/72428843691.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/soragepamizam.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/68315252661.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393d07e999f---lafujofesaniwigigizifuru.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/linebipotebizulawova.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///fadexiwuw.pdfIn PDF document text
    • http://meta-min.com/files/98782056194.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/96778198515.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419b1acfd67---8028715672.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109141109403349.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rojixapuzupajam.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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 18132 bytes
SHA-256: 10bf9d5ca93d349c148fed4276e315cf33c83adb9b3d7a556eb002cfe0dceee7
font_01_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 10408 bytes
SHA-256: 7f7c6064f995c222048102c0427002efaddfb574df34be22a6d833b849dec071
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1