Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc39ce7c39543f19…

MALICIOUS

PDF

90.1 KB Created: 2021-08-06 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a1d72981300e4cd76ed6bace80446e5 SHA-1: 16977f1a65f1833a53240989cd93b9f385dc8abc SHA-256: fc39ce7c39543f196dea9df81f096e95856f6d5572407f12aeea794dcf34fb76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=embriologia+del+sistema+digestivo+pdf PDF link annotation
    • https://braindevelopmentmaps.org/userfiles/files/tixabuvowu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ic5prh2arilegvdr0sive62d42/95022607842.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/2504628217.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/gamejubepuvurud.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/98015793503.pdfIn PDF document text
    • http://funperm.ru/content/file/getabobuxo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d685206d---88496551582.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/gegiruxumabogude.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/91657411999.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc41547037---remes.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/88567978741.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/04f4bc48d1b7cc2ee22f8dca99272c5a/nugezabipojum.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/gobarasodubozofagowido.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050210443694.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/78232034938.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/labujogefegeb.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b5478f453---57549078951.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/32550707742.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f9fb28cc4911738c82be89451a2d5702/28157821945.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8d598cc5d---vanisixajabanurowigelu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2c272028a---rumekoxutakokanopavowaji.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wisokelitepalamowamo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/30326321940.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_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 10928 bytes
SHA-256: 0503314c11f4049c21ec0b949e0c3863d2e9eac29852263ee005dfc1b9b5ccbe
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 18472 bytes
SHA-256: bbc9c5bdc90babc70ceb3e5316886dcf1dc7adda1fb33654b1c43ce6025dc7f6

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