Malicious PDF — malware analysis report

Static analysis result for SHA-256 106be5ee73c931a4…

MALICIOUS

PDF

92.2 KB Created: 2021-06-28 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 997b03842d8e2287959cba8ecd6c5b60 SHA-1: 7b3235859b479f7cfd9817f037b8b6bdd07201c8 SHA-256: 106be5ee73c931a450a74d218e0ca853020454e3f50fc364a1ce05e0558e08da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The presence of multiple links and the nature of the URLs suggest an effort to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=real+free+followers+for+instagram+apk
    • http://caigeshi.com/uploadfile/file/2021061811054573499.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceab195177---poraxigopaxula.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/lojamadivetixirag.pdf
    • https://guclupin.com/calisma2/files/uploads/gadavutelizugezajub.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607889a744c29---luberodijivu.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/vizudogefekuxekuso.pdf
    • https://grup-insaat.com/userfiles/file/bukebaxijagaj.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/mtesj5b6s035e1913oh1urrgic/zolirajudalanukajezo.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3f88ebd11c3661a262170d9f9994ea4/1378202770.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3dc6455b---zitovovane.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/17596642985.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/hdvv8brcjnb8gv14sl30ieui86/46161838691.pdf
    • http://sugarfree-gelato.com/upload/file/43526973539.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d5d6c43ad4f689610988998fd037f02f/kojuzedogasufese.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b71e8136f---xiselevovap.pdf
    • http://romanakladatelstvi.cz/userfiles/file/pugiforarakenobife.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/250b73151076111ccdbb1c66dfc2a008/95847847693.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ec3658cfd1eda3ab535c8e39b09905dc/34037376691.pdf
    • http://akinmedikal.com/uploads/file/89310614564.pdf
    • http://tcihk.com/userfiles/57914982849.pdf
    • https://mylodge-naoshima.com/ronodopidafufewu.pdf
    • http://hasici-pristroje-eshop.cz/files/file/mebonaximanetesibilajejak.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/26ppddmk9157j9fjfh0g12f1m3/bemazominaxezivamivo.pdf
    • 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_off0000f7a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 16792 bytes
font_01_sfnt_off00010fb7.bin
a497885698e5f95c739e816f8ffb785e3e184b547325950b92f00d88fe60e866
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 26680 bytes
font_02_sfnt_off0001487a.bin
db03eeb76e21b6342e12d29e72f67adc0b9aac9fafcf16ae0831d7640ff413de
pdf-font-stream PDF embedded font (sfnt) at offset 0x1487A 10924 bytes