Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8216ce03af6c9d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 05:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 08b47589034b9176badd43b15b67b73a SHA-1: 6b1734f523d51470210c022bb4ecfd89afb557df SHA-256: ec8216ce03af6c9daeabed80f9d4dc53661742a0e3f80bb14a406d7978b0bc1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of 'utm_term=hack+app+data+play+store' suggests a potential lure for users interested in hacking or app data, possibly leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=hack+app+data+play+store PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40ad1e7be---60714726995.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/wesazugigefozobezemez.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/zokututivikexu.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a4d72ff20---sapelibubibepirujo.pdfIn PDF document text
    • https://produse-zilan.ro/files/79948684125.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfc73de78---senuzilezavikuvokufaxot.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/50705543817.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///86259826846.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/99081703807.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81002793029.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wovanuzebalo.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/xawiwasenuwexanasapen.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/95757702761.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/nagobolidubuziweren.pdfIn PDF document text
    • https://casaalu.com/luutru/files/sapab.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/28024394270.pdfIn PDF document text
    • http://tulga.ru/editor/files/95687182636.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/45299847934.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/59771685024.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/66438343746.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/fiviganuzep.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210911023304.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/putajirulugopudorufira.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 10508 bytes
SHA-256: 273005125e9fe65ccf11f68704d14ade6bd375f33d06ccd729cb8ef768f7d06c
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 18208 bytes
SHA-256: df2c5ca81856fe2bb5204410bfffaabc1ba15df936f8e6e198cfcf6193ce4cc3
font_02_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1