Malicious PDF — malware analysis report

Static analysis result for SHA-256 913c48db9c69a260…

MALICIOUS

PDF

83.0 KB Created: 2021-06-29 16:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2cf75f3957780e19ec10b54df928743e SHA-1: 2da62a37e916ce3e566adb1db641705324e126e9 SHA-256: 913c48db9c69a26074cd3419813c97aa135716bd86acc241ad2769aec2e62ade
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of multiple external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3a25d1ad9df5d9d0197ac53135161b55/wopuk.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b9824b0eace---gewafivisokinevibeg.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/32978658129.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cce898cb55126a294091522c58301d6/dumakisuwapukatiga.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62981107532.pdfIn PDF document text
    • http://zuche0551.com/upload/file/mozuxuseresazififazosir.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/35948821601.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c2f0c9bb9b5e0f98698aad855687b6ca/nogimixitul.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210510055022.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/99080250578.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/443bbefbd8b0f9cffd1e38af6b0f9d5b/74313115536.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/94328359063.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/33847751027.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15e659fb1---5062580452.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/66add14b1d942b3d42b297554a0807ad/xetupixomonadanizixufol.pdfIn PDF document text
    • http://sakem.org/userfiles/files/pipejiruwutirakapuf.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160878d1a2fb73---37516065008.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af95246c56a---fonabizelul.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/39777482490.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/82354000294.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/52870294501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+merge+multiple+pdf+files+into+one+macPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16872 bytes
SHA-256: 9725f0f85d62e44a8a2ba2985a05eeaee1ba290b9b35c019aeed33bcd7810a03
font_02_sfnt_off0001230d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230D 11140 bytes
SHA-256: 15cd96e2be3ced6b514aa07daa437ce878bc159418996a8739a0528c135db9d8

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