Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9d05dbdf35959f…

MALICIOUS

PDF

82.2 KB Created: 2021-10-24 04:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fdfedaf1b33384cd0fe2953b53abc841 SHA-1: d1b0c6746d7f3031cd32c50b8faee1eefda2decd SHA-256: 1d9d05dbdf35959f800ce82287a781d2649ba95f530097dee43c8aef0ddd275b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to unknown or potentially compromised hosts, suggesting a link farm or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ros-audit.com/i/up/file/74341819560.pdf In PDF document text
    • http://www.rpv-drachten.nl/files/file/zudowugekenonopisituze.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/37364496931.pdfIn PDF document text
    • https://menu2uplus.com/images/file/26222101565.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8sfs2bmbfgob6p2p733t6lpsvj/wozefupuwisokaluvoriti.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j328hb0ckmve9bhi12i99ke41/figudunupetujevubavekarif.pdfIn PDF document text
    • http://xlith.com/userfiles/files/55078338379.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-10-18/20211018162731553242.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202110081052335813.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/65263552468.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/31112580456.pdfIn PDF document text
    • http://silver1979.com/upload/file/pegud.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b59a74541b---17039711380.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109230347337931.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tegolobedulivoworidor.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/2543994554.pdfIn PDF document text
    • http://youil.org/userData/board/file/duwunifuteledozig.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/94884997225.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/93337952821.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/jamirinewu.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/tenuwovigemiwupozaseloni.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dokakekiwi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/870d9e6365923c83c870024961225642/5255170252.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/35157666073.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=george+benson+in+your+eyesPDF 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_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 19784 bytes
SHA-256: c7d4bd8543f737c471ab8c466e149c248480c25f2b637634b008709a8fac5757
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 10368 bytes
SHA-256: 9bd34dda49710c0b2ad40ef37fcf0f8915bbb7ef444c28a6efdafb9963d4a57c

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