Malicious PDF — malware analysis report

Static analysis result for SHA-256 4522bb19c698be07…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 22:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 847140b043dbe639282a34c4efbccb99 SHA-1: 4fc587813d481f60eb4056efc96e44cc12c4f7b3 SHA-256: 4522bb19c698be07a5bbe24957589a3f0d1237608eab39dd6ca032155cd98f24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further exploitation. The presence of multiple unknown URLs suggests a broad campaign to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/trtjl5lv9mvdvalajh28viop17/lupabum.pdf In PDF document text
    • https://holcom-solar.com/webroot/img/files/35491749355.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/suxasilivezezumafirosut.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jopagisipaxogoterikev.pdfIn PDF document text
    • http://kaies.cn/upfiles/210905234823367018n8o80d.pdfIn PDF document text
    • http://th-hl.com///upload/files/5150065541.pdfIn PDF document text
    • http://belloverde.net/emailer/file/34523066947.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/58340233704.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xewumivowekeranupedotab.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971522572532.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/kexofepitiji.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ea8cab58---54160000152.pdfIn PDF document text
    • https://msiutilities.net/documents/xidoz.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/webodujuleku.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/70123124752.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/29508778867.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/92503990256.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/7440595205.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a014ce270---delosikisugijisukub.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/97451983232.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rl3ehdspbmrltq5lpgadr6g8j0/gorusiwonad.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/47011580094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+audiobook+app+for+androidPDF 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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10828 bytes
SHA-256: 26b8be16448d06f31dc40fdd53154edeab15e65c036bab0f6799d94cbe079336
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 17316 bytes
SHA-256: eb834799d59b07bc11367fa45153b4b12430c8dc227f82a95082ab2e07ac2b5c
font_02_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1