Malicious PDF — malware analysis report

Static analysis result for SHA-256 725440233c978cee…

MALICIOUS

PDF

86.0 KB Created: 2021-08-19 06:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04a584a180cf7421ed8596214f651180 SHA-1: deaec0a70c8a7315b2f3e10a7b9df0258c19882a SHA-256: 725440233c978ceed120d7ed498281a2b0667fd1a9fc26648a8302e7970d4f46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ed89b57---vadoseniv.pdf In PDF document text
    • http://belv.ru/userfiles/file/rubofowuduna.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cef7f41006dfd3be65e1ba0f0be79ccc/35263670613.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/21539771115.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d2e38bb0---fanavonol.pdfIn PDF document text
    • https://everestart.com/images/stories/file/54910599027.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/2233504506.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/47fa894f3bbd6206b78d817a50256e69/jukevafisuwukuzofazug.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a93ef1893---78113026941.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/labizazusuriv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/37488994733.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/8887024791.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161119b3989097---powiz.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b2e580d656fdf62c77547181048fc17b/62848701207.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fijemetitofurowidotibutif.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/20ca35a34e75612b9ed29038e5a5f83a/25622542157.pdfIn PDF document text
    • http://raczcsalad.hu/files/97374140639.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/68401835802.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/76698307195.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6a68b8aba60b39ecfe5108fbcba96441/35523907382.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/rugaxapibegu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d6c98cd2689435db3518e6a09566a2d2/82297293417.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j1ad0tm1c366jqvokis5rdk7g2/69217866062.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/r3864a2un29jvsno5n6scne1c7/82247479853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=business+courses+in+gimpaPDF 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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 16736 bytes
SHA-256: 84e8d82293bbaefeee0099e4d8e39639f1a8939dabb9f4000531f5f1e85574e7
font_01_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 10724 bytes
SHA-256: 6c06b1d5c24adc0f1a2f91ad15a96e55d99dcaced485c05530a15766bdc4c967
font_02_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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