Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e8f1e46cbda39f…

MALICIOUS

PDF

141.4 KB Created: 2021-07-22 09:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 23188c74063e51ab56cf29c484535d44 SHA-1: fbb0f7383f4d99afe352e25b6a9d974b2fc8ee75 SHA-256: 48e8f1e46cbda39fa9d1b5b2b53cc8329aab83f641104dc2a64091bbd0a29af0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The file contains a large number of external URIs, many of which point to compromised WordPress sites or other potentially malicious hosting. The primary function appears to be acting as a link farm to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8321

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160778536d7158---62581277173.pdf In PDF document text
    • http://smflow.in/admin/uploads/file/49379457324.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/gukavizojosutakejamanewa.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/ximisinepidanasazetafox.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a7809719---92011328772.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/75439337238.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a36f6b51a8869381ce11d572d13c9e2/29934446430.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b2c6002b---jufuxedebe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/30380286953.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c550c9c7b4a---60202237965.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e958c74c9b84150103bd577ac7cb1938/jevijuvuju.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a1ffb930f0090ab34fdb39db877f97f2/pedapudusaxavumoro.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ne6kit6ujqvef3nbg4nf42ue5k/6517947409.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080eed6cb7c0---zatogunowikit.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608922abb3485---7319899760.pdfIn PDF document text
    • http://holtfamilyreunion.com/clients/5/51/517903a0238f10651a3d170edcbd2d86/File/ramidimur.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kt67k4emnivo9csjg9t908g1up/wufovadiluxepumoweto.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561ff7c1f21ccf73f42701d5f05d4425/12511784829.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/bebopemule.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/buzugebobaxolima.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/4999561286.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7839fa20---worijus.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/d2gg5te717hb2mdpk6pnlofmf8/zovamezu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4727d008---7113745418.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837b3393c04---pefon.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1d9f684af---zunego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+pitilessPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001eab3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1EAB3 31144 bytes
SHA-256: 74416d68bd85cbb04864218955ae1e6a78eacf7a2f25c808e64570e434c9570f
font_00_sfnt_off00014b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8D 10092 bytes
SHA-256: 69c72061c41d2863bd3ecec11dc001ab6d7526e1e79db6de6858a64567d597b2
font_01_sfnt_off00016222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16222 37492 bytes
SHA-256: fa388f2780c357b656b28760c6f85c6c93d470f44992d2e2fb7396595f57e258
font_02_sfnt_off0001b3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DC 9584 bytes
SHA-256: 12daddfbc1d30201f41228c4e1cce7d0c60ff3a81f7cd4b9c27f9a3bc6f318b9
font_03_sfnt_off0001d2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1