Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a68c62aeb67d57f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 11:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 584cee3a26d7ced1dd4984bfeba81b8b SHA-1: 62840e5d030c026764a1f893cbb57806547f9f8d SHA-256: 1a68c62aeb67d57fece00f961f7edbe92aa6679b75cac6e4586548a2e18d60c2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the structure of the PDF suggest it's designed to lure users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafe3edee2---sabokomeguvesexazilufu.pdf
    • http://files.ibiza-ferien.de/file/bobegesokejovov.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490efac0d0---galoluvose.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8279174e03af71fa2e00250ac88e5eeb/45570040174.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/34b23a8058fec95209bd3b4ecb234c48/pixubu.pdf
    • http://btc-ltd.com/upload/file/gawegomavufofeza.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gkb61k5ap4j9l3olo9hncq9p25/tapamolufum.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65200d7cc---bezokozabaru.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/42eded57ccdf47a4c8fdfff0eb5f07ca/18595462414.pdf
    • https://mongolia-volkslift.com/uploads/files/12057524817.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a528ec0c0---59593522795.pdf
    • http://gabortech.com/admin/file/57898992315.pdf
    • https://nhorizontours.com/userfiles/files/55446296762.pdf
    • https://laplacedesstores.com/upload/file/74018508030.pdf
    • http://dolphinkorea.com/files/files/wediwitobinodir.pdf
    • http://asremajazi.com/uploads/files/litojiwiratidiso.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/vee0j3kf6e54ue41qkm3uqq08e/48690337148.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/11441047349.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4624e1df098a3c8e2cdda7976308248f/waduzuleloravelotewopugar.pdf
    • http://artecgroupservices.com/imagenes/file/2430204899.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aea8729496b---kewoke.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4f85e839---23858661371.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ccb392a6c---91551184284.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5682afe38f4c4cf4750132cc9b41e2fa/vajogiwilukog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+to+image+converter+online+high+quality+free
    • 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_off0000e903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 16792 bytes
font_01_sfnt_off0001011a.bin
c7b38723e20e4c3d6e18d7a1c3dda54b9a8d12b4b7269481fc007c59f25b4a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 11180 bytes
font_02_sfnt_off00011a8e.bin
a915aa1d54c621ea001e11907f2e94c9e970db4f68c80af87a47daa5d2f1eb95
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16768 bytes