Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d768bb47febcf0…

MALICIOUS

PDF

94.5 KB Created: 2021-07-04 19:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d55dd96aeca3ee9e33d1644a077bbf40 SHA-1: 53b02a2ba0778a0b2f21310c3f1e4aea86e41868 SHA-256: 09d768bb47febcf05635a952a8aa32ec26e268f49cafd76a4c28527ef8447243
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. The document body was unreadable, but the link farm structure is a clear indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/foduxovitu.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f427c663---84808057594.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xokesebivagi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0b8abaa1---nobolujixidonotanexomij.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34de14e8b1---newafopusidebige.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf26dcc0c83---98029134025.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a61b5de46---62450579760.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/70547980467.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/babulasuso.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/89258634729.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4cfe01e3---rutemiwasifep.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/gumirijir.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1e6dd021---xexazixupugera.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/34617341174.pdfIn PDF document text
    • http://miguktour.com/FileData/ckfinder/files/20210625_7C2B7F8C79781A0A.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b85e5d7de---vejinadoxaredefesoso.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/45300022110.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e4a78535---27571033412.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/62939975023.pdfIn PDF document text
    • http://paliukenas.lt/i/File/43985658251.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848e460d2f3---33880214235.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ec2218fd448d3a208ab41349833872b4/51752498868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=metaphor+for+smoothPDF 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_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 10372 bytes
SHA-256: 54c5a9dcd73891d16e5de91c858876a95cdb4fd651a9782c9945458b1065c902
font_01_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC5 18212 bytes
SHA-256: 07ba65c99903b38a2a069ab1acef52dfacabd5a1b6dea2c49a169141c418b36c

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