Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f9838a88887958…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 17:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fead7297260169485de3fe791d2892a SHA-1: 5269f54fec49824a884b2d73dc9eccf78ec0a090 SHA-256: 83f9838a88887958b6c79878b3a3291ccd60b1c58e55178e5cac44f362befbc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://budka39.ru/files/texinapozagu.pdf In PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/84564400273.pdfIn PDF document text
    • http://sbairs.com/datas/files/sofevadisedokuwuvewi.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/83037194094.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/16163115111.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/65878336277.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/sopixukiti.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2e7225b000c57d16d434006b1555b648/10963849222.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xepulinaf.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wuneguxapudanina.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • https://actorconseil.com/files/file/vewamosuduwusuma.pdfIn PDF document text
    • http://drtamerturan.com/file/36331675999.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/basadufijijidemosewi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371919e4829---buwemutilotebifizupasi.pdfIn PDF document text
    • http://moretonassets.net/userfiles/85447349540.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dbf9a789c9adf0a7b03d5523c8495d93/bekenus.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/13360316925.pdfIn PDF document text
    • http://kammed.com/userfiles/file/bupubipu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/40556641247.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/28577020390.pdfIn PDF document text
    • http://turnyras.lt/Files/file/19683677074.pdfIn PDF document text
    • http://candientuvibra.com/images/file/rabubebadur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=otouto+scramble+remake+mod+apkPDF 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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10836 bytes
SHA-256: cc5e9dbe46d623b435ea242969e0cf0f55e9b24b1b78c85e262b22c9e0e318af
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 20384 bytes
SHA-256: b7dac60d8b8b86172ae908499271ca0975e8a35e65a29a60be94936126f213b3

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