Malicious PDF — malware analysis report

Static analysis result for SHA-256 4accd22d46ea01fe…

MALICIOUS

PDF

90.6 KB Created: 2021-07-26 11:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b90d634171efda66a281fc3eaf8d0c74 SHA-1: 0326e1b9346747961c9c7873aff7598a3259c3d6 SHA-256: 4accd22d46ea01feaf0a264fda6e74c00a78963793dda469a86cea73fa5b5948
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is heavily obfuscated and contains no readable document body, reinforcing its role as a malicious container.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://cissud.eu/uploads/ck_editor/files/farotiwowowixekela.pdf In PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wumalalubevuk.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/bonaridigutafazed.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/naravefepozigadagedu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa51acdfc---butojemevoregeduxebekite.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nits21sd9tioskv0qpr86j0tf4/fejovotuzenuze.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdaa1dc9a---silikalosimugumu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/wufotabunebamafegugop.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/pijosaw.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b289ea23e29---42427071102.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fb101c42b5e5adbde712d9e0a79c16c3/rujuvitemojosuxizudexi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f49119f04c252a2a92cb164675b68f92/viradanagajelulojeli.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/50920068394.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/7601472023.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/xalikiropuwale.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3927556944.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/jumoxijut.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/91714498431.pdfIn PDF document text
    • http://suaups.net/userfiles/file/97622137635.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210615133506.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/tezosazasiruzedel.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ce079bda9c5dbfb536146a769c37a941/21890098923.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e26210a6b17---43151879799.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/31671832820.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a6e3d7d8c37a87bbf39428bc4090b76c/48615390948.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a39706a7c---lutir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+spell+of+the+sensuous+quotesPDF link annotation
    • 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_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10312 bytes
SHA-256: 140b812ad267d279c8f2ffb91cb0ad421df8e54a3075a52f9e89afd030c9208e
font_01_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 17360 bytes
SHA-256: da59920aeed025c9588c0a926a999077a5b80b616d9b3fb4c27b630dfb70ff74