Malicious PDF — malware analysis report

Static analysis result for SHA-256 c103b2ca63710571…

MALICIOUS

PDF

99.0 KB Created: 2021-07-02 21:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c349ad3dc6c2f16874e9c7e0c7e9ee02 SHA-1: 29f27807e0793924dde8b2d100943c584e4cd64f SHA-256: c103b2ca637105715452cca189cfad9a094892d67ddd73ed2a8a5fbcd9083e0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded URLs strongly suggest it is used as part of a phishing campaign or to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://cructi.ru/uplcv?utm_term=series+similar+to+penny+dreadful PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f16bb8ef3---dasuzubirokakoris.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/vumeronagazezokakabu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1dc61ab3c53e06d76d50c04efbb78efe/43830431191.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eld7or3epgio4qh4n5id61qs7s/wizezelapagapefezeji.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/613f693712f864758bd7696b007a9f36/butuxozu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d0ff9be7e5653131bc3164ce0386d935/gutasewosizodobamusubexe.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac07baf853---joromexajegegon.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/tasowifawikazegasa.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/64161909529.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106120649192050.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fab030ee---45751109118.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/abbd102299e9c5377af136b76ab1ba0b/rubezuzasinoz.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/rinosetomavateruzon.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/446b6bfeac078af5708a6f8a34c5414a/75338785954.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112d401d2f---filujojosop.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917e2b4d729---7823368007.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/lesuzogenusiw.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/744442d6b4f1be257a11364f01ea6152/rakoweminogorado.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7cii1bicktnh2bmeq80frunjsq/968368457.pdfIn PDF document text
    • http://guowangcable.com/d/files/bebufolutizisure.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/vevukefafelilawubadu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc946af1b---80913076079.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fs8cgb18m1f9t24gahefodrtg0/52459307523.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xagutujimolaf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 10948 bytes
SHA-256: 599b187fac851e9a2aafdf5b086e51296570a606ccea052d9d0305cc7fde43ea
font_02_sfnt_off000150fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FB 17604 bytes
SHA-256: ff4f59e575b7ebf5e824896874f7f756143103a26fdaced23a601fe582d57e13

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