Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd77b44dce4b6b4…

MALICIOUS

PDF

88.7 KB Created: 2021-07-19 07:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 705e796a34cd4574fb425b315ebcc175 SHA-1: 15c677b8b2c03b9ea7e33a0a3baf885ba579eab8 SHA-256: dfd77b44dce4b6b47a91da8632c7b96f5b90749374a27d4553b5838094995700
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and IP addresses, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links strongly indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/54geq4i9jgqsg3bbhr42vo496r/39030440715.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a49002b9---6340903890.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8169891e9---ravon.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/wavisonum.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3c9afa68a7e6aaf7e54e5c2270a38cb8/dokarogut.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/kumazedupazavavijojadew.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c4e22d2e8d5ddc808e7386f5f345e7f/54015041569.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/68427634569.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/zabeg.pdfIn PDF document text
    • http://surtek.biz/image/files/20150122_191731.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096477399ecb---16003748090.pdfPDF link annotation
    • http://timeyear-v.com/userfiles/file/25438532331.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3s3khfu9bkc9fj1a15ranphft0/53215141799.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846529e64e---830280979.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097630283034---93403789637.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/99974901149.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/bogavat.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/sumijotilovaximesatir.pdfIn PDF document text
    • http://jucal.es/images/file/45335783001.pdfIn PDF document text
    • https://andrejc.si/files/file/sesimo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0dfcf9d2---jupoxirerowuzo.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/62153918664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=causes+of+liver+problemsPDF 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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 17240 bytes
SHA-256: f914e7492ae1c4761338918888f632dc2500e186659f2b856e6ba0fbe2a987f7
font_02_sfnt_off00013c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C13 10656 bytes
SHA-256: e7ab6bac906c791d881ddda0610eec2e9205a54e648a2975568bbcc18008269b

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