Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a26d2bb377032f4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-15 12:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 854c29050c04acf37998398cf53f1e48 SHA-1: 4d913dd935e0e02adb665b94d178de4d324763d2 SHA-256: 3a26d2bb377032f4d03f5fb5b1a122b8d97ec394c1f8be0ed0e76140030536d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to trick users into downloading a payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to deliver a second-stage malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://termosystem.pl/userfiles/file/kemifikinolurebufe.pdf In PDF document text
    • https://weilaimachinery.com/userfiles/files/38968044059.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/dodivakatuni.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/dimixamufidumalur.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/t3a109quofr1afk9p604aq3gk7/36477968176.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4211182332.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/vupoxerazatu.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/15280565429.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5673066933.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/77510870019.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/gurumafepofuxufolokaju.pdfIn PDF document text
    • http://ativn.com/upload/file/85797086918.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/goleta.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/gutakoxevav.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109120103355436.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divivanidebip.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/lotanegu.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/sizadupapiri.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/pakuvujaziputarel.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/13434421895.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/77088836285.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/9507016765.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319d631c29c---71784998920.pdfIn PDF document text
    • https://webmenuplus.com/images/file/34443166015.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/nmuorqs2louokr6m6mntae08ic/5691150386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+sqlite+database+for+android+studioPDF 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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10820 bytes
SHA-256: ac4476be4efc4d07e4917e46899c090f42b6a444a21c48f341c248012bec5a67
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 19712 bytes
SHA-256: 4be178c231666ea3dee58af3227558bf750c2226ad3451c0f169447ca040d8b0