Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3fc14c070b9d9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 22:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb57d9a6b00cc5328d6df07bf13d9e05 SHA-1: 9d684481739ca8d275a2a115c7dd3d2df0a0a3ef SHA-256: 24a3fc14c070b9d97b540b440985d25e9dde8a450684d2a1b09d2b9f025e32fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the high confidence scores from security tools are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=sachin+saga+mod+apk+download PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6o4i2ltc2mj9v7d5dt1ipqpitl/97243041758.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/nofexupotanexesixuzekusig.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9148160a---kivavitufatonenekufa.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/97655222874.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/tumeneraketefesupeke.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4da63a69---tuvuwowemijofevadudafe.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/14885943014.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jeperitojoluzotomar.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/66650907442.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/14955138954.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/novufud.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/20090056852.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613882e463447---2089249711.pdfIn PDF document text
    • https://claudiodituri.it/uploads/80504995787.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mapaxeje.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/45227577601.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904075324071.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b000bfd59---nuxavezugafuviro.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/17156635370.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f135a687e---jowopus.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f2prj9nlnoap0mkh9e2o1vn0e5/vizegenuwa.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/gituzikodowuwepafesez.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/lonununerifupat.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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10884 bytes
SHA-256: 7c02c8bbf7152d829e8509f21c5bd8735298ad462852bf1e25552692b5595ec0
font_02_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 18552 bytes
SHA-256: c5b1762ce8ccf979143afc52041a89bd7ec931e41683393252ad308a01a08d87

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