Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d1cd2e7ac23abf…

MALICIOUS

PDF

88.7 KB Created: 2021-07-14 05:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb4603755b29c17032abdead9837e2b1 SHA-1: 0956d04877c28221541bbc61aba71831550c352d SHA-256: d2d1cd2e7ac23abff0d2262a72035a16b72f78acc6565b18cf1a840d1ca9bf18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://corghialberti.it/file/vomone.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/f609bc93d04ea914cdcec96c56c8a545/fofurukemorazu.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/82886460765.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9c8e60a6a2a78dadf1f2962b68d81ee5/66239080340.pdf
    • https://edebmachine.com/images/media/files/bawubefevemona.pdf
    • https://estoniapools.com/contents//files/51394375164.pdf
    • http://fujiya-la.com/uploads/files/demamagaravomijujuzokenat.pdf
    • http://acecaalcoy.com/userfiles/file/mexafuxapurug.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/16376511739.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/fexosagupadezaneju.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/zigobopazepit.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2e521e7b---filagapojim.pdf
    • http://kartywspomnien.pl/uploads/assets/file/61923576648.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b573ebffadc59d96825e3c1e72aa35d4/koxatu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1fce591291dcfc2c355f823d7fc0ef13/fapiletobojenab.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/601a667bd7550100ebbe5fe4e9df1c63/35163129549.pdf
    • http://philcoastal.net/ckfinder/userfiles/files/71428224475.pdf
    • http://jagamimpi.org/contents//files/33140573435.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b6ee56b4b0270ce07bc031ea47bb1ec5/191699733.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a835dd29c56---dugixupajuxadedolisebuvu.pdf
    • https://hoangnhataudio.vn/media/files/13887796126.pdf
    • http://thedewakohchang.com/image/upload/File/8881047721.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160786b086df5b---85253179124.pdf
    • http://linkingpeople.info/userfiles/file/65916579013.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/u38m547q3obfm0lg6fkfklvg46/15848994368.pdf
    • https://larrialdiak.es/files/galeria/files/85174938649.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+email+1+page+of+a+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_off0000f5e9.bin
5e0dc7f02a627f0adbae2f7e56e1eea3101842ccaf97f43b6ceebed8053a8229
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 10600 bytes
font_01_sfnt_off00010e00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16792 bytes
font_02_sfnt_off00012612.bin
0a61f560d15017876993d71399128d8eb51cd6f4fa5592f12ad179d3bbdbfabd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 17532 bytes