Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61177c0182a3d4e…

MALICIOUS

PDF

71.4 KB Created: 2021-08-28 09:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a77a0fd74483cb394d451ac560f3a24 SHA-1: 08318d24c70e22e14a86ac9af71ecadc453c9824 SHA-256: a61177c0182a3d4eac2bf278ba7cb1f34f015f45d96bbf251c0292bfad43a7ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple external websites hosted on compromised CMS platforms. The primary purpose appears to be to facilitate phishing or distribute further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c20fd0dd5b80ff4a965344d2e4ef414a/155590063.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c440ef21afc6a6deacd0a29e8c1e6b0a/71538098462.pdf
    • https://butchercurnow.com/img/shop//contents/27645562990.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fab91ea81c6---zibugeletisigadoned.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfs5ng4dvrplrbqo7mesqesucq/80854926971.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb4258e23---74361139306.pdf
    • http://seamacros.com/upload/file/26827713481.pdf
    • https://lavaecucebrescia.it/file/14482325592.pdf
    • https://insolite.lu/img/userfiles/files/gomelefo.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c3e21f55100f757a96a1164ad0b214c7/56127877002.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be1b911a6f---62492402385.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/78066699050.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/db94025a93e5db207c0c8a56ba4f1812/47478990196.pdf
    • https://koncnc.com/genelresimler/file/20865865199.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rdecoh292arcr6p4gi0uhlqap6/89245254607.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/jobofalonaxuzepa.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xuxij.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/bd02b90db23b880ba04acfc55bc54ca3/wuwufuvuwa.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/refekaninuxatiluxi.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f789a33d---fipexiwosujopowobojosi.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r5h7oben3g08thpb1ut0l6ktd8/24535547985.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/20361752886.pdf
    • https://timminsrenovations.ca/file/1QJJxVVCve5DDLzK.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119d88673b---gejimopujawedakexafokano.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=word+of+our+testimony
    • 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_off0000b9d8.bin
8730e0ce850a5d4a35d18c8c289d543a04581c46d73160e5307dcd6760426f6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 10512 bytes
font_01_sfnt_off0000d1ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 16792 bytes
font_02_sfnt_off0000e9e0.bin
2e1a69c909953d18040c05768358eb5e1e262f54727ddc1ff1651aa5f37ec9c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 15044 bytes