Malicious PDF — malware analysis report

Static analysis result for SHA-256 873bdf36fa20c1f8…

MALICIOUS

PDF

100.6 KB Created: 2021-06-30 19:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1a168a4c6fecb50f6f69327c36ad4dad SHA-1: 4c3c7e8412e946923ca1b5c4b5c06507ab538a1e SHA-256: 873bdf36fa20c1f885bc88abe32beac9bc40172f83ad466037f2e95cc9d4c751
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1566.001 Phishing: Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interpreter, such as cmd.exe or PowerShell, to execute a payload. The presence of numerous links to potentially compromised CMS upload directories further suggests a malicious intent to host or distribute further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r2ai4apoh3fn4li98skqs09hf6/temiperusejosijijazo.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/5717145702.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/34054993958.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/21072238595.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607450bdcdad7---4289062909.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/95122891283.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/71aeb570430a5ad7fec97e8c54d24622/tasebowabexexitegurewaxuw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07249caea---bowagogewedizifapasedim.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741c3850217---xabedurozi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/natugerujulomimixozifon.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ced5aa17---73203929450.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff2f994e9---19955371963.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e3ce77fcc---bunulajirapejofelojativi.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/zebifogagom.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/g1dtji6bhg2f55thh5odpcfjvo/77309594638.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/28d88d1dfa83a8d37bc51f886695b8c3/rimax.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607007dc44a26---4641370263.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093c0836bc77---xavorowepuz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/23491760561.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7296489c93---kudufilaw.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/28c1bd857f6fe8e60a4edf52536cea4a/ginijatekuzikevorux.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/josedowikudigisaxofuwi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ddii61mib039epcidhn2o7n5v4/xasarukaninudutabenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=using+make+in+linuxPDF link annotation
    • 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_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BF 10436 bytes
SHA-256: 1ec27cab28040df814a17c4c5ec5834ec54b465f1db554bafef5f12dacf24511
font_02_sfnt_off00015154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15154 18740 bytes
SHA-256: ce513a67596bcb6df67cb7922b3f82f425985531a3433373091f213e130978a7

Open this report in the interactive analyzer, or submit your own file for analysis.