Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad74b79cb165ab6f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 18:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 940785a69c489fd684de9e159dc037c8 SHA-1: 7eed49b6d155e7ee9922c872999605e33506eb2a SHA-256: ad74b79cb165ab6f350da03ea869cb6f307073949894491f1a013bd9f0d308c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bc-arman.kz/ckfinder/userfiles/files/taxamojuretiwivipalivu.pdf In PDF document text
    • https://naveenent.com/administrator/imagetemp/file/71233151329.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210908041507.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/18058385985.pdfIn PDF document text
    • http://tianfonmm.com/d/files/zonulonog.pdfIn PDF document text
    • http://101balkon.ru/upload/files/81587871028.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210903201503.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/48914890245.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/85538313978.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee59e85095---42267903070.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/18072790297.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/91003115142.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/85469854782.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/86767519718.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/nejuna.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44236920278.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c38f38064055b72a98c1a1dbf7c4b6f/34578541988.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/senukonewu.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/loxeferugu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137d272aea0d---83398200353.pdfIn PDF document text
    • http://arucax.am/user_images/file/nufepowezajafili.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/moxudirinalezumudanijapep.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nozafakasumepekezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=photo+widgets+for+androidPDF 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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10676 bytes
SHA-256: bf3a24bbe3af2b388114ee3b650acf4042251b42f3edd0b72f0819095c113754
font_02_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 18164 bytes
SHA-256: f843d4cda83c4f68c090a70481756c11683a7f4f1ef5a88c0d93cd96fd77ec71