Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52e9c1d768dbcab…

MALICIOUS

PDF

78.4 KB Created: 2021-08-04 08:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adfd750bfca7e679661140bb741d28d6 SHA-1: c0babf6a71212e8899f0c090cce77133e971bb7b SHA-256: e52e9c1d768dbcab8c0ab138a20a014fb84e6770e1f1d1832eab83590d2c65ef
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves leveraging these external links to lead users to malicious content.

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 http://hart-metale.pl/gimnazjum/userfiles/file/27634607908.pdf In PDF document text
    • https://airshow-bg.com/file/90354634087.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f43b29d9---31624431408.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/gevagi.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/48479565351.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26b2e612ab---jixidijokanupit.pdfIn PDF document text
    • https://33mobility.net/uploads/files/sazalo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c4caedf007e9a22a01bc64264f4696c1/461376244.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/43783658858.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fb6b6a69---87545694848.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a41dcc0b---zavivawaw.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/vumoxukabesiti.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/62849782287.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6f42hnl5b8ottdvgf16us3qm7/87513255125.pdfIn PDF document text
    • http://allasclub.com/campannas/file/25960472676.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/84502429648.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/kagenuwi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d8411c1b---dinuxatenenakudumavap.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/wavabogil.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/19029182053.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d48b9624---11040905259.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cfcbfe9b909454a3471c77cc4a3b46/4424051405.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/jubuzilorivoredovudapof.pdfIn PDF document text
    • https://paperland.bg/uploads/file/penoxonux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+chemical+formula+of+kerosenePDF 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_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 16736 bytes
SHA-256: a4a17d98d8d6b4ece43100e4898d19ea5c9a50f52437427e7c62942ede33fe18
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 10788 bytes
SHA-256: d8dc2e5eea994ce69453bc40e1badfce6f31cdc27c8b9642d70bf44819d34238

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