Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e6f4ca68aedce4…

MALICIOUS

PDF

95.3 KB Created: 2021-09-01 06:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aebf987925dc7774a8fe521ec5366f67 SHA-1: 676b077b2d70a8e05ea87bb70a5d4a713db142ff SHA-256: 31e6f4ca68aedce49860a170c6bf0e83cebbbe3defcc3ba9aa216096f7bb8958
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=boy+cut+for+round+face+girl PDF link annotation
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d23plcnb20ueatuu3dkqgkt12q/faferu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e40175c3cacfcd2251b2c5a9d4559fc2/zezosasisonezirapojosa.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210520102743_768397392.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/jaturikomitumik.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb809f3b3a2---26302456612.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210618123419.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c651d9bda5---74271450037.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/38655978651.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/lunalenitipaxavezaji.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/39771960098.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094fe09b3755---76359146846.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090349d26504---fefevabowulijo.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/gikazazanukilapajanazok.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/bugowad.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6fbe1f6e66cb55775a6e380b3462b56c/jokanasuwofekananovemanu.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/66215109539.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160988e88aea1d---niwezajotababovanewe.pdfPDF link annotation
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9cb31312f---nefaruni.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/57228505725.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161056215e5c93---72405856561.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vexor.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/dawunog.pdfIn PDF document text
    • 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_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10748 bytes
SHA-256: 5b6914ad352ff75bd1a94153fe0f82ea29db1bfd417ce2c47499c10aec2c096c
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DF 17304 bytes
SHA-256: 888a3fd9befceb19bb5f71aaf0096178b8c77185ff988c96bb3413f263ad5a0f

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