Malicious PDF — malware analysis report

Static analysis result for SHA-256 a940805c4e226e69…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 05:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3247235dee69eee1f44e042a11e92d6 SHA-1: ae46794c42cda1ea1b23a0ace71e5e0aef5383e2 SHA-256: a940805c4e226e69e80786cf9abba240da207ba17115b54ccdaf4e242b8ff47c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sasalidayanisma.org/uploads/file/60347898712.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a07c92530a---zarimuzo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0232f2312---sefelogajevi.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/40880624184.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c64d11a9d3c729c6d2c14302e4a30129/mifakaxazurapu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9aa8e3b4---wumitumonino.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/bakum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002cb9ed22---satudojamum.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jv4q91b2tttacoer11cgppbtb5/xunofexaw.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6138b9aa89574.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///15859717354.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/veliba.pdfIn PDF document text
    • http://stl-hk.net/userfiles/44296353766.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/49526944152.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138054f8044e---vuxunas.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/banamawefixolufen.pdfIn PDF document text
    • http://lawngo.net/fckfiles/barurowatekalufikito.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/4890002001.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630742585.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/20955084215.pdfIn PDF document text
    • http://domosplast.hu/files/file/rerarutolaleset.pdfIn PDF document text
    • http://boki.hu/editor_up/xewutovesoval.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/78824110573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+radio+app+that+uses+antennaPDF 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_off0000d7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DF 16900 bytes
SHA-256: 9d9046874fbb4094e62c90af95a6947999459b7b8bd5fc7ea11a004a3267f890
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 10524 bytes
SHA-256: 348cf7ce26b63f157c43d82755c0392d42eda81c44fdfd88cf1c210ae83b7333

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