Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f33ee560208c075…

MALICIOUS

PDF

76.5 KB Created: 2021-09-13 20:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed9b2af91ed30e26464fe3e8eff94c2b SHA-1: 6fc7ee62a03804864470f169eafbcc3a2db48810 SHA-256: 1f33ee560208c075840a53f75727eb0c4522f0275490dab9e4eae1a8acf5e8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=reckless+getaway+2+apk+hack PDF link annotation
    • http://www.dr.schure.net/ckfinder/userfiles/files/33530345058.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xapipitinazedujanuvagagil.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/55935587116.pdfIn PDF document text
    • http://benetalent.com/upload/files/34593481996.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/70650694802.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b420aade636867b016b84257c49107e5/5765733616.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lidosanisibigaliwubanod.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/77564330650.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/sorajo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/dofulofarid.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodutadawonogapopukojisu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/18136005385.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109090946194414.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vowinugunorowazezevafezo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bd921c79c58b1e7e997c7f3909c08d08/48686165174.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/13696519261.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/32617438801.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wazilozaxoborileneruvufab.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032db69ff2---mitorujuwilovap.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/40535690853.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/21448300508.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/26551804008.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/somogekawupidamoti.pdfIn PDF document text
    • http://373113.linker.tw/files/70886897064.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 10696 bytes
SHA-256: 8caf89ab9ccd6792d6f798e9025325217e342e8d1d74c1f79a5eace3a6c54719
font_01_sfnt_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 19000 bytes
SHA-256: eeab401b5428ca03d8053cbd6277069c9721627716e16acd3542c6aded227ac0
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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