Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bea0770ed5ffcd…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 01:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dbeb8fcdcf1e529c92d4a5af81dca97 SHA-1: 6c374c94fd97836df98c9e312d896519dedcd059 SHA-256: 41bea0770ed5ffcd75f2621579732c416e37bc3e6253be6ecfeb11b5c27bbfbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further malicious PDFs. The primary purpose appears to be directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=evil+meaning+in+english
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tj12uqehj1q46tkfaciifbrci5/piputowakano.pdf
    • http://bortran.com/upload/image/file/20210705064954.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1af30bb0---sujetikipakorajofaradu.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d22f50e9272---40078015516.pdf
    • http://heibldr.hu/FCKfeltoltott/file/xofukupagizo.pdf
    • https://telewebmarketing.com/FCKeditor/file/81111200930.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b77e321c2---ragokuvu.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0010f84014---bejizawagarajoge.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79cd24cab---4722833054.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/56763631837.pdf
    • https://matrainagycsalados.hu/userfiles/file/82219061755.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c057f3cc453---fukevomag.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/66v332lj51uq7u3c1f8oe17qnl/75453183959.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f61f384c---43612768522.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hi9urt6747rihteci8ov2pmqj2/tosiz.pdf
    • https://larustt.com/upload/ckfinder/files/31316031109.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34c9bd99a---68626212746.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/rrv96vfo5kebv2n8tdqb2eil0e/nuluparevutu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/atgea15fkf42o8q3ichrpra3le/5091740157.pdf
    • http://baohanhranghm.com/upload/img/files/furoz.pdf
    • http://notariocprietoa.com/notaria/documentos/files/muxapifijegerodomawut.pdf
    • http://csc-028.com/userfiles/file/20210629215652_10g98t.pdf
    • https://ctsgroups.asia/images/file/kasutomokiroxezumukane.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_off0000ee2d.bin
3ccb64e619a07cc165c7f96bd5170ba4853facadc131ae0895f9e39a36839911
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 10284 bytes
font_01_sfnt_off00010507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
font_02_sfnt_off00011d19.bin
226966f3394e69b64873284612d9e61b170eb51a9598269f17d2906f2d6fe6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 19056 bytes