Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9538a5d3675f70…

MALICIOUS

PDF

93.3 KB Created: 2021-06-29 04:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd17654bcd34df2d841816592364eb55 SHA-1: 839a94805582e3279630f8af181c00e51bf94192 SHA-256: 8c9538a5d3675f703403700539e21a11e70a628ff82231938a6474803bc4f935
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting suggests an attempt to distribute malware or phishing content. No scripts were extracted, but the overall structure and URL findings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/vfqi4v8q812n8ktupc7km8f2b7/mukixijepolo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e2c2b126---bevidegajilibafaxatika.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf475b1a0---48231743781.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e6207f34---54902505782.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160763d922c3c3---96624750297.pdf
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/takusug.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e62b42006364680fd2fcf90f9cebabdc/8734824802.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/142eceb98d597f70b7c33e2bf75f11eb/67413029131.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d748a07f---98765792245.pdf
    • http://keramann.ru/uploads/files/joregaxunibivated.pdf
    • https://amatnieks.lv/pictures/image/xanulemutisiweket.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/i1himhphab2uc3q905tuikk8pb/xodokadanir.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077e344c23da---64123766184.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/7el5reir02538t2pgsc4skfs6b/60744463645.pdf
    • http://mppscstudy.com/admin/usercontent/file/toxigamiputibol.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/db8d444a2fe29a5b00146cb7e2997767/45256390221.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd7a9354e---83593123985.pdf
    • http://mistral-paints.cz/userfiles/files/2006979298.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f709c0154e---5324195747.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/4181221348.pdf
    • https://itchanoi.vn/uploads/news_file/41077356949.pdf
    • http://asesorgubernamental.com/images/file/69115002815.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/1737348391.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+mod+wither+storm+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7eb.bin
48b6dac5f9f2922c86c2d17d4f51b84742229e06e67a8683cb3916ea40adf61e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 18648 bytes
font_01_sfnt_off000128be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BE 16792 bytes
font_02_sfnt_off000140d5.bin
898647607331200211f6de339e2e68ef2e5b7feb8772462d7c1c56e75fc96fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 10820 bytes
font_03_sfnt_off000159a4.bin
00e6f3c97599053d3e90330b733c9fbf8f8304ec6b63bf468e97771849df35e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 2940 bytes