Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6569f4bc9ef232…

MALICIOUS

PDF

92.7 KB Created: 2021-07-14 00:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63d2550f31dc842377194f0a63336b98 SHA-1: abb9d69e7cc48249c373b8629a8918eb88049f2d SHA-256: 4a6569f4bc9ef232f1d3ecdeba99d6ad489e8d62a33b7945eabcdd9bbe488641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eko-inwest.eu/upload/file/7741280634.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2a9b7016---48695462780.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5cb82ab99bf350f3960f0082813267bc/2346776390.pdf
    • http://skomi.ru/img/files/file/mifibegafamowuf.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c248414d545---fipuvapowa.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c4929143---dijujinaxam.pdf
    • https://aawyx.com/sites/default/imageuser/file/jaxijobilixonile.pdf
    • http://18554080.com/userfiles/file/fuwudiwegadakufobef.pdf
    • http://classicalgardenornaments.com/uplds/file/tatavifofuzi.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076245b9c426---zitujelolujogexo.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8b7a86cc---xonat.pdf
    • https://mdteam.se/ckfinder/userfiles/files/sikuloxama.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/64879224738.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c3592006057ccd7b899d11256341dc9c/17085396862.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa44c749f---ritiferedipozujo.pdf
    • https://sjalikave.hu/pictures/file/mawej.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/828db874ed65ab2a70224e1362af8057/34577514398.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc43761b2---69349237269.pdf
    • http://m3hotels.com/userfiles/file/44508617214.pdf
    • http://cupta.org/userfiles/files/20210607000042.pdf
    • http://mistralizmiryonetim.com/uploads/file/71845957712.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b33287526---58231446768.pdf
    • https://aydin-elektrik.com/resimler/files/nisisenotumiso.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fad3c254---tesakudogi.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4826c1f973---vozoxetuzikofubinab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=golf+right+knee+downswing
    • 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_off00010a06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 16792 bytes
font_01_sfnt_off00012218.bin
469f0942c6094490aaf68117816ac4093189e343b26d23c8225f22cdb5981858
pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16904 bytes
font_02_sfnt_off00014d6e.bin
45796e0d44e1eb0ae389c5e3c3229ef79611d676f9b7d5fb86af66a1b151db60
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6E 10688 bytes