Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7e896c59b59cdc…

MALICIOUS

PDF

77.8 KB Created: 2021-09-04 01:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4bab9d102afc2ce281226ceb609393c SHA-1: 7a819883c8344798c4a00c309a78a4dc0ed026b0 SHA-256: 9b7e896c59b59cdc1f84cdaabab1085ebc1ed423bbaa60e5c9be8fd9dfa91e58
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4n73se3s5rikeam2a8cf8652s7/tasoxof.pdf In PDF document text
    • http://hornets88.com/clients/56662/File/kokote.pdfIn PDF document text
    • http://royalgroup.at/tmp/65933681148.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nikumawezamijewas.pdfIn PDF document text
    • https://clickbox.ro/images/file/88877957689.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/turolizafaxuzugidijib.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/wanorolarewakid.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b0ca4efd---foriretudilutebi.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/70671569724.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/13808339322.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/fobuvumexuruf.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xibuxamuvusatulifat.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/92833063265.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6e65bd1da---90151063449.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/dilanozirine.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zilomovuxawivagijasozitun.pdfIn PDF document text
    • http://ud2-140.com/files/remenufixawobasidaxegaw.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29674299624.pdfIn PDF document text
    • https://masihpt1.com/contents//files/zujezuvimu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/rajumowekus.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nh4k3o34u97kmk1ok4t97tce43/29989418348.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/kimekowegepojul.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d8593b7ffe73966f7f536b50a9178ba9/17267287176.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160857bbb65dd6---95343828310.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe98cb5602---zedasurodesixiwosawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=food+hypersensitivity+pdfPDF 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_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 17096 bytes
SHA-256: 0c6e78c6d7197a5b721c2e15eab13693ff37fd4708b48d8dfd1a75a438b53150
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 10544 bytes
SHA-256: 52db7c5d8e6737ec35c41d860f4de82dfae68ada504e3b04629c76bca15ef10f
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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