Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01198c48e19a5b5…

MALICIOUS

PDF

90.5 KB Created: 2021-07-01 13:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edbc8999752e410584755d4843c9e6ea SHA-1: 077d347dd5183c7f7e1bc3b86b2711e45a8ddc5a SHA-256: c01198c48e19a5b5be9c317e7bac8b2ef1c85c5b401067e9326a9d38153e032a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=mozambique+and+south+africa
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba2ed96c356c87fb2f9e63e232b78f0a/xixorev.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160780f6fbc922---depozozazaseta.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aaf0400f83b272740f827894e70b07f2/3116091945.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e0958d5829266a82dc1f574294d353d5/76071019378.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/5bd10dd6ade97fe76e166e564affc3d6/vapuvula.pdf
    • http://podushka.by/files/files/pidurubodomamiw.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sjd84t79ocko4u9ajh5d025g35/71542103226.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6b47f24a00d32eb794adf5f97539a05f/nejuv.pdf
    • http://planbmedia.hufiles/18552264079.pdf
    • http://aire-limpio.com/img/editor/file/penokeve.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/385bae32875cb81d64dcacb06c5c8904/48636521869.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6768a9c6c---nigupo.pdf
    • http://forter.vn/hinhanh/file/46674570736.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/3279359091.pdf
    • http://asokmontridental.com/userfiles/file/94869088083.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/54049327349.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e73dee7b35aba18f4a87b1d02137e4b0/dadikovufikuvewajiba.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b62bfcd7bcc8a7f1d6259c069776f385/jubutoz.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/90912006772.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qrdp242vviq9ct6b2d7nlc1eo2/dinem.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9626f97862---14625173832.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4cad17e366ae27ba6b55139de5bd7675/17432812102.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b7673730e---65373616828.pdf
    • http://finproekt-msk.ru/userfiles/file/18789100466.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05b44db03e7d364bc0b91fbcae9bce20/xoxamepupofobufa.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_off0000fc06.bin
ac1a0086de95c866c4e140302b29d2fb2cc85d4bd2ce900d5733ce159bb904b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 17344 bytes
font_01_sfnt_off00012961.bin
07118dfb00988200f6465d235fde0373e13f4ec8853e1dd4c36439d81f2da04f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 11136 bytes
font_02_sfnt_off00014305.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14305 16792 bytes