Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd1dd9129afd8a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 11:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cabd2aed688bb0206c0dec0d553e7f3f SHA-1: 91b6228c1b01beaa851d4c8864aa76acd0fc2aa8 SHA-256: 4cd1dd9129afd8a64edfa422d765898dff0a430551ad3fd54b6f9b0c4ba7cf86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, some of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yuqiaohome.com/uploads/files/202109101321421865.pdf In PDF document text
    • http://arndt-fahrschule.de/userfiles/file/tiwepora.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogabegoguloxemubavaz.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/91916470530.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a00e749---5173007535.pdfIn PDF document text
    • http://www.andreapondika.cz/file/68895712815.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/8087419608.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/554e8eb10128c0e93b2928a804d3a239/zurotizudib.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/87066090254.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/fanixikorija.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/zutuparikasewetelulisodu.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/56040743818.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/nazumero.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/wutasibijarinorizanu.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/86888969192.pdfIn PDF document text
    • https://alariel.be/userfiles/file/wabazuradujinaduz.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/lidufigakute.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e9b040856188e8dc278bb5e4c41f675b/vaxepasapisetavagarifa.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/38344157172.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/74983727659.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kisamufuzoxa.pdfIn PDF document text
    • https://attack.lt/images/files/78984792628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=offline+free+music+apps+for+iphonePDF 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_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10772 bytes
SHA-256: 064cff45c2f1b94dc80e092ee3d080622542344bfcea4a1b5e2b36f49a5c768b
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 17920 bytes
SHA-256: 2d7342a3335e37dda3f74a3465c0305fdb5086cabfcbfb5b8eb3c9da1605410e

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