Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32cd0aa40848062…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 21:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04204cd98f503439cd8e7cad58a4f12b SHA-1: de2962aea25f822d1833f29b6ea9e99db70eecfb SHA-256: f32cd0aa40848062c9add49f79c68388626286ba1968f832097eeacd874fb50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

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 http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/59019396807.pdf In PDF document text
    • http://albertopizzetti.it/userfiles/files/fipurevuxobelubovuzoxu.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/65712627367.pdfIn PDF document text
    • http://mq-water.net/upload/98531384884.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99801614280.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gimanube.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/62116521834.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/bevizigezikas.pdfIn PDF document text
    • http://japhina.com/upload/file/zevegadere.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/54566824514.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sosuxaxip.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/22723171666.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/83191460543.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a88a48662---88668627563.pdfIn PDF document text
    • http://bjjiffy.com/upload/jopoxojokomolekoji.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/tusetexisinefilawukep.pdfIn PDF document text
    • http://zenkatsu.dk/files/mezobadovulokeron.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210913201641.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/70725793105.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a0186ca62---12460377544.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/wogise.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/68992752248.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0f073dcdf4196f01f8ac52ec2ec592/77374455339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=windows+8.1+to+windows+10+freePDF 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_off0000bcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 15832 bytes
SHA-256: c792f88f647c62c362ccccfa19eedb64865737a47909cf48d51083a43326a121
font_01_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10664 bytes
SHA-256: de1d5cabe48a3deaf452a542a393db9c2935592e1f31f366f998f5d4b8aa7e12