Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f3c108ddec55e1…

MALICIOUS

PDF

85.6 KB Created: 2021-07-21 18:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d9c5f1825d9a5081c56896cfb29e2027 SHA-1: 59d87b535fcbbfdd18a0f5259fe3d0d07d99b4b4 SHA-256: 42f3c108ddec55e1c4fb4f0038c5542307be479250919985abfdfdba26eda631
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://bitite.lv/media/txt/122/file/64876598640.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0bbb9240526c8d73c409513aa7e979fa/zonelujowokafulako.pdfIn PDF document text
    • https://flyags.com/editorResources/file///33727704080.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/merinuzogo.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sazakofesozafezexivejiv.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/07618ba782c9bc7a58aac4b28fd1344e/38744870039.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210616201513.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/71273271102.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lasesumumuxotuwavetoziju.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd70656641---sabupajeketipunapel.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b321f8c791---dimudurow.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607339c4c02c2---62732346363.pdfIn PDF document text
    • http://webbuilders.com/files/file/gukagapubuxedutokafis.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210624/file/16245027299054.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/0301a4dd782636711f1a4332b5fc8cb3/kagelubonipomapa.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///fasejuxe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf16eb6ef---34047918295.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/onf0veoe5mu19uov1nbvvv3htc/11196370937.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/02468cdcf690dc123781c07f8e59c841/97915840687.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/95817650107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thank+you+interview+email+teacherPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 16428 bytes
SHA-256: eb661d0861063abfb8e1a91a7a0d80c8593dd994306387641869c19c2835d425
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 10748 bytes
SHA-256: 4487219901b8db6d6c403917e4af3288c61979a13c0600dc2790513161d60e19