Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf800f9431fa019…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 02:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 536ecba104eb1f3e7649a94943856aca SHA-1: 1f28143d2ad881cef289631ebfaba9ddcd01db19 SHA-256: fbf800f9431fa019e2b24e3a02e8f93e6229473f408ab459fee68e736b409b4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple link farms suggests an attempt to obscure the ultimate destination or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=autocad+text+height+chart
    • https://licorne-hotel-restaurant.com/userfiles/file/xobajukewuxubiru.pdf
    • https://puppometalli.eu/file/pitafuninuwebaxumowefu.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851f7dd3e68---32905881959.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/74889091337.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2fb08d108ef126734cb481e71a9756e5/1097631469.pdf
    • http://gianniarnaudo.com/userfiles/files/tumedumakenajezaxigatowo.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c819609063---75633865139.pdf
    • http://rencontres-icare.org/userfiles/file/zakejikavoja.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160892b60c7e8d---92185718474.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add0b3d0b4d---vivozegezananofu.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987dd9cb345---11418566316.pdf
    • https://pindimana.in/uploads/file/fukevobiwola.pdf
    • https://newtech-utm.pl/userfiles/file/43931663564.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/6ee9e6c89d2fcd52e7d6f0012ca2e0f4/naretuletamozasusewu.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5b41d2360c57d2540602c8372af0ecde/14351565068.pdf
    • http://bensonlandscape.com/editorData/file/risotuseserepipegu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b4002a1a4---rigujuzowovitedezunej.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac90fd9859---43017182327.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ilfa272d3ii11ldi4vn2o9g0k2/74110324970.pdf
    • http://playeasypiano.com/resources/fck_images/rukibubevud.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6251732d2268e22c0cfa75f193ff06a2/66345157097.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cfa585fb5---75967560298.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/42801324450.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/135a716102f81c039aaafce3c1be1903/zabifeta.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_off0000f44c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16792 bytes
font_01_sfnt_off00010c63.bin
813bcc955b7de4e8450bbcccaf4cf99743091a2ec1a548fb66ded9d9d87684cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 10512 bytes
font_02_sfnt_off0001244f.bin
b5a5f6a976b9484ba999066c173396e060222412a6ffbe7700936b2cb899d9a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 17240 bytes