Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd86eeed6a03555…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7525a95d9de8fc64a439934c5875c494 SHA-1: 35889bc8ccedcccb5ca0aa8b51a4ca0c2a6d02af SHA-256: 4fd86eeed6a035558b589f5f1734631133a10da714016a382687fe69e770ce34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cplastik.eu/data/cms/file/98752667185.pdf In PDF document text
    • https://groupunsur4.com/contents/files/fepesabo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613206ee3f541---81755144160.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210908171708.pdfIn PDF document text
    • http://rvhifi.cz/files/file/kififusobufegewolovora.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/zibevurixifegapedotugone.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/23899341073.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a021f9c2---85422549429.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xeloxejemezorigupajumogu.pdfIn PDF document text
    • http://inphilong.com/upload/files/77293136731.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/55311834830.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/xazuwidom.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nenokonorune.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tuvabiwur.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/wubobuxixadi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c1718e73---pojibugozatos.pdfIn PDF document text
    • http://analhospital.net/file/files/48166527211.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/24059951555.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210915153427_80twbz.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/19688107820.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/dozipewulekoxobetirilozes.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/70535964425.pdfIn PDF document text
    • https://cian.hr/userfiles/file/solekobokokerubus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+dance+of+fire+and+ice+free+playPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5eb7c65b133bd78d4df6efbea0287ee/76506191906.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_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 10440 bytes
SHA-256: 5656b45b440fef975ddd0ada651f44ec608986d3aef0c5f81aa8e8689d2bc423
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 18432 bytes
SHA-256: 17ee04280cf163d9f9d29cd861961eb2fed4a6cef4431fe6de5f0c81d7f4daf4
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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