Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f39b536b00dccbd…

MALICIOUS

PDF

119.0 KB Created: 2021-06-26 18:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df3f5632dc649a081303b0d76f4066cd SHA-1: f515317674f0914a9c31ce3f19b21df44fb0e18f SHA-256: 8f39b536b00dccbd72c46183d2a42e5c0127e795821c349f3ef74e0d5d62ab99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging T1059.007 if JavaScript was used internally to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://wastran.ru/uplcv?utm_term=how+to+draw+catalyst+fortnite
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076e8fb07e5e---3963257202.pdf
    • http://stjconsulting.it/userfiles/files/sebunozujuriligud.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nirupibibozulajixa.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b52012d74---14479821050.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dfd0a4af803da7f8fecdb86799003e26/52360139397.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082635eaf3b8---46423538362.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bcffaca609eb353c391e4141f2243659/liriw.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfd9046ee---45347768730.pdf
    • https://hashtag.school/userfiles/file/dinokumem.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/g3qj2r3icncqifpv2fvvklq15s/ditomatubonizilal.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e15f7e294b158205c85a078cd49971cb/ginikipizinifoxot.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb773e3e2f---2204762944.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4tkvjj0tvvrfbn3l01hm73nuc2/70066317878.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vigaku.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38a5aa8d1---74852278617.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/872c2a7022de30e38170b96bda6aa37c/78033202009.pdf
    • http://adamlegal.com/userfiles/file/33937576665.pdf
    • http://begemot-rus.com/uploadfiles/file/2021051320322673499.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/taeeqog69is5leue8ntc0f9fvi/lewizidesezopijesoxu.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29fc57de1fa868f457a02dcdf0503387/3129825954.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aacc154ad7e---88531427302.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015aeb.bin
5a5eb1b1d74cf9b253be337bd30c647e891beb31d34bfca4abd6d32bbd4be92f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEB 10660 bytes
font_01_sfnt_off0001737c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1737C 16792 bytes
font_02_sfnt_off00018b8d.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B8D 16164 bytes
font_03_sfnt_off0001a0ff.bin
08193290b497a5c1553b8a032efd33deda831d1c8c149b5981ff0a041aada8a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0FF 17516 bytes