Malicious PDF — malware analysis report

Static analysis result for SHA-256 39977466125b8332…

MALICIOUS

PDF

72.8 KB Created: 2021-07-03 00:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 317aa6b72ad9a6dd9f8d0a7ccd2aec96 SHA-1: 35b33fb1bfc7df55d27891c4093673cb0fe23037 SHA-256: 39977466125b83321fd84d93accff3442b1203143da61a692d5194c07c208953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

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 https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/79f87407ddbd9c4de4692105e2e86d36/kegatenu.pdf
    • http://4grd.com/cmsimages/file/47450011392.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160742278c0f10---79204665372.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efa4f27c2---bomomuvaniwoni.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13540c706---95175629265.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b285face737---mimafozawojakinulogomi.pdf
    • http://obrienbuilders.com/userfiles/file/panilelesalaxotuzediva.pdf
    • https://abe-rdc.com/userfiles/file/56476306354.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/29df963a99843659e3022e66f6c0a3bf/26679942922.pdf
    • http://domplus.su/userfiles/files/22284100120.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088e20e5acae---56687805572.pdf
    • http://yilip.net/userData/board/file/52099502667.pdf
    • http://halongbaycruises.org/upload/files/doveri.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090709d5145e---43496331980.pdf
    • http://gld-lining.com/user_img/files/bosikepuvuzupiwim.pdf
    • https://oliogalanis.com/file/xarifuwe.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb57c0f02---dixugozadamugen.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rsosencnn51r6e1n8qv8rf6d3b/37421497512.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fb29625ab4a7bfc11dfc9b98a4bc2145/lupit.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/88svbgmhovko96ghv77bdb0454/33295055225.pdf
    • https://al-farh-iq.com/upload/userfiles/file/ditutojenorodosad.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2a359b85---noxir.pdf
    • http://yacpa.org/yacpafiles/file/tojivajiweresapixovafa.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160776736084bc---64179519797.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=transformations+of+polynomial+functions+worksheet
    • 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_off0000bacf.bin
eb8d000c574e8bb7e60341b9376805a8e24d13224f900eaf6d3ffdd942b976a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 16212 bytes
font_01_sfnt_off0000e4c6.bin
98d431442d9000db2ddde02f57a5fe92a244ad5c68369f24022831c95f52074e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 11100 bytes
font_02_sfnt_off0000fe98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 16792 bytes