Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed99ee1e71d2b80…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08b8d4e296d3a3a069ff449f9e77399c SHA-1: e404e4553daec18ce8ea0d79e2b9d4a0b852129d SHA-256: 1ed99ee1e71d2b80808b2ba1ebecbf09ce39cc5ac30bcc77821bf2ac86e1c784
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading malware or visiting phishing sites. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af46f992319---gefetamideza.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4r0e1lnvvhnqrq6lvtqc88clt5/56527248238.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1c22e4d---livuxipininuxaxap.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7be064a1a6a98e5078521af38543d5ab/86812065558.pdf
    • https://299-45.com/CKEdit/upload/files/tidalikurubigarupuxuwe.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8267b0e---xuxupuwabupusanipixe.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2cfc27bf4cf705265e7599f180a14cb2/zepukeketoxetaloro.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06906c19---96923918795.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/buzizijexegowexoninararap.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03f61e596---6647448487.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89661acc2a---butekuleruduredukewibezow.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084db4f4ca63---zebesibanezomovesujemezux.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608647f3293b0---20384286914.pdf
    • https://ludifrance.fr/userfiles/file/siledobozinafebuxifuf.pdf
    • https://techson-cctv.com/upload/file/18962833160.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f0c27b04---9324166570.pdf
    • http://beerskiboot.com/img/upload/file/84055410610.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160848608e9d5a---44394025810.pdf
    • http://sistersaviopublicschool.com/userfiles/file/5289528252.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608272a3f3cb2---vujebugotanox.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l6l9k1ocn3ela3b2t7c03141u5/nutedefer.pdf
    • https://fruzsiflame.hu/userfiles/file/letadosajijo.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a098e22adf85c0dc02ca13f332c2d9b4/65105056499.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/38057ef1e740ccb23fba96c92b7387b6/88233304198.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gta+vice+city+download+for+windows+10+pc
    • 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_off0000ed98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
font_01_sfnt_off000105af.bin
36e1cbf767d5061186b359c12d17bf44500c1864a721478368dfcd4a7f2b6ed4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 11092 bytes
font_02_sfnt_off00011fd5.bin
a84d95cee4e9f18ff3ffc296fe7fd898f75ff197ea58ea82fe2a3a59528fe979
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 17112 bytes