Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44cbc71ebfaea77…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 12:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d3a9c0fa655b2551b8a7e484e192ecd8 SHA-1: 260f7fb33a6ded594c6bca667054477071a33a20 SHA-256: a44cbc71ebfaea774b067cfcca371223396f019f126572d82ed05826de490ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) strongly suggest the PDF is used to redirect users to malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=list+of+government+schemes+2019+pdf PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7df3c0ef44bb38306220e72ef9290212/26652613346.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d991cfc5c---wirebixedizewatozezo.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/fajezatodab.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909dd87cdb3---suximeduvukufene.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/77977202510.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/1492597505.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/paluwegitazujegunerukoliv.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/xadetokusolazize.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210609_CF738809EC3B9F49.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/penewelejunidakifaxaf.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104406939dd3---78528946467.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108302210456855.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/64948867273.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/15549389375.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kupogazox.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa934e08d0---82611621110.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a185762a1---xumataguwoguvozizijesape.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/paladotokokujefa.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/16377022320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadde98f375---55732018446.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aced168cb7---67780689532.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbb7d3ae2b---22895573621.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/65728332952.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53361e71d---70126560396.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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 17592 bytes
SHA-256: 6af813f5c9a4cef773ab7ea59e6bd996d29af74dffe93eb0e056e187c3950e6f
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 11344 bytes
SHA-256: aa98584340390aa7a9fd37bbb86b2b23cc4299f39d85f322958dcd4c16f2ff60
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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