Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e188ec6c1196eb…

MALICIOUS

PDF

84.4 KB Created: 2021-08-24 07:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c445ccab7c92d55b16ce2d3fa498c7b SHA-1: 587465df303f4a06229455c7540ce6743b0df92b SHA-256: 23e188ec6c1196ebf1683d2cdadc13658ebd9d8c52b4272dd52e39c51b35e442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress upload storage locations, likely for phishing or malware distribution. The presence of external URIs and the nature of the link farm suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sie5l0g5r0rq40q66sc069gej0/30936713771.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5bdf97ceebf79d75f773a03ef116c81d/53738286478.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e5a282eb---64437441489.pdf
    • http://circuitoinsulargc.com/documentos/file/68494689635.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d72b54df---81159628854.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d0a5219d---mevivuboliridusofetesug.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982888ea5ed---56827175128.pdf
    • https://keluargamimpi.com/contents//files/73609207656.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/59296598967.pdf
    • http://adabaskimerkezi.com/upload/file/metozupodosopavi.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9470afd90---48661409587.pdf
    • http://hotelbelleepoque.bg/userfiles/file/dasosunoxuke.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee886fbcb52---29095809606.pdf
    • http://hzzxtl.com/UploadFile/file/20210716022201175.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ad6c91299aa7fd321c45afb34b0d0fa8/28723349367.pdf
    • http://minhquoc.vn/ckfinder/userfiles/files/24275481619.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6b4d23aa4371c5aaaeab95bcd0ffc8c2/8065705315.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae4dc3740---ritikevulidu.pdf
    • http://mh-gartengestaltung.de/userfiles/file/68732842424.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089f549c5d2a---94017770875.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/17357418053.pdf
    • http://aaronandanthony.com/userfiles/files/butugojajegu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdf
    • http://pomocnaukowa.net/Upload/file/tanuzamabo.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba46de73c78---70328543154.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=software+to+convert+ppt+to+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_off0000e662.bin
e72d5741b885032c70c9992951d8358860b05af7c29f2bc79836c8eec729379b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16472 bytes
font_01_sfnt_off00011152.bin
018da60980ea451f0e2b2424873805cb5d48423b66f3f97efaf3428de80276b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 10532 bytes
font_02_sfnt_off0001298a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1298A 16792 bytes