Malicious PDF — malware analysis report

Static analysis result for SHA-256 addf9ef3086712ad…

MALICIOUS

PDF

112.6 KB Created: 2021-07-24 06:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 94963861232ed930a10681e3c7eec51a SHA-1: 0805edc01ff12cbeffe440693e298d2dd618c3ce SHA-256: addf9ef3086712adef338f19536306df6a25209f57beea15ec06e0d40e930b01
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content or facilitate further downloads. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://tevukasveza.lt/ckfinder/userfiles/files/jatipajiwirok.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/38896929325.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/zezudetiwojufepawi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5e5e61b1---62723860582.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b19c561a3abe5f5f7fd0b2549c328bc8/39358417476.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/43909227810.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/07rm60gma7fr341ahqi7d0rdik/xanape.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab26d84e4---gagutowoj.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///92279892299.pdfIn PDF document text
    • https://33mobility.net/uploads/files/loposalulurifuponujoja.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9f39970dff43c87ee237ae22954db85b/riwuwip.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/29c98c744a7a8ebca152b5500b0fbaa3/gafonezasu.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/oqnnbmglf4pdrtmth55n6eo791/varafavor.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4c214834---fazififidonowelutiz.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f09bf5c499209f30b504e713715843b4/didevojotexazuzejemojozo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/bunufo.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/21779202870.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uc3hkq693cd0lo2a738ev8n139/67658614201.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098698cd9f08---55336581094.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/824e309222c606dbe84910f8e161dc9b/lubulisidezig.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kasivafofafukivegatidag.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5137c42a436accdc60febb749447423d/kikefutolajujenadiwobi.pdfIn PDF document text
    • https://mmszke.hu/files/file/pixafol.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/59826279653.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8eccc97642455e5bcf4c01186b53ca9c/56830918839.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8fr7f37huk7dujj8b7kj7rkft2/vamuvomugugoralo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee45066557c---42047268195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=creative+organization+chart+free+templatePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F9 16920 bytes
SHA-256: 19446d8b64786df93f1d9cff2825b9ffada1c8457343205fa0b5b1f4033d0000
font_01_sfnt_off0001802c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19843 10916 bytes
SHA-256: b52901ed24882c7d5e82ba137f70fc15edd34232452e499d23baf8d33a17475c

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