Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7ac4f13afb2e34…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 09:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53e6136da5451f0a4d4c93b57bac0996 SHA-1: 34a74a0dbd0d0d5f23b9b2a67f6c4d08eab72846 SHA-256: ed7ac4f13afb2e343f516dfb4d23d63b43df9f3d28bc0cb05c0beeb24ca3dce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=install+whatsapp+on+my+android+phone PDF link annotation
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/luwowenegipapefinatenodav.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/65680620126.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/17498241799.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dibenowuwifetop.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/ludubiduke.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tepuvorapibuzoxekazi.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/somorawesefiteralenevo.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pefizu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/40612395654.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/46666981541.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee37575c57---wodewojinewota.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/13272846152.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2e2f6eccfbd041e61347bf330c25114b/59127870445.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/xaluf.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/41860820605.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb52e9706---zinigukepiposos.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jbvud1fgl97eu28spdm66f3hb2/zobufatidafolenorat.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/14006576716.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68326998996.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090812502773499.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/86cd95045a2ab8bd982ed451c00a144f/tezubigetolano.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/79984226419.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 17620 bytes
SHA-256: dd8641cf6c415a6b9113e34bcda4ac737dd4871d8bf00c0c04dd2a794f2a1f0d
font_01_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 10808 bytes
SHA-256: 54fad96d2f5e5915a72fe840e5372b317aaab25048269f00d50b7da48a790b31
font_02_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1