Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4948adeb54bf017…

MALICIOUS

PDF

83.6 KB Created: 2021-06-26 06:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96ee64ca5e7173e2a653287743a2c0fc SHA-1: 2c4d50c030bb101d9598e0cc959813ab03b48f75 SHA-256: b4948adeb54bf017aa09381c5a8142adfb7697d6c091a1ed1cad98c6b1a16c96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a48eb0b3b64---zerifibowu.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fbca2f5540d96a5746d0a5b2f8f441a2/33697234299.pdf
    • http://weberstellen.ch/userfiles/file/84775577828.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/vug12g68ue87ogtprmgeu2eafv/kemutitofo.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cca317g859oun4uo561fhmria1/25795270765.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/kokulamaviwekulowa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/21cd1dac78a443b0edf6a1bc569173fd/fuxonif.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/25aa0f78d05a2ae1d16609abe3006fa3/77056270056.pdf
    • http://teplospectr.ru/images/files/11909762877.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5cn24i2a2nqorcr1n4mfuu16p0/88835360427.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bfda904c1993a49396009afb17ddce5c/74003599530.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/51d84f01b61024844177ac95a9af9174/32783613652.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oa8ud1ckddr0eb747g3s2g9s27/52825375603.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfefe60261d---vanegowikaxelenugoxu.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8ca450d74---18513071185.pdf
    • http://sns.hu/_user/file/27382806061.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/joxemipikutebefimewepa.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609838b722760---71974105302.pdf
    • https://abofahed.com/userfiles/file/87859994522.pdf
    • https://majubesar.info/contents//files/tanim.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d620b3b7a2798f837801625c1dee0532/riwegutuvixazetizivar.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bd6cc22633e0e60e3eb40fbfa16de650/43660881910.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c0295de2---sosezexinasegun.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pfu8kqento41qmaoo5fpvh4oha/tiwezogogexawokemuma.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=motion+in+a+straight+line+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b1.bin
4c0c584946ee03f787accdfb184cd2e01e6f1b22d35774ae12174e2e29c01001
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 17076 bytes
font_01_sfnt_off0001103f.bin
979c6d9a30598b640c3bdd7c6d245d9880429688de80fce61b0e4f697b504de8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 10852 bytes
font_02_sfnt_off000128ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16792 bytes