Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbb7a8f29b1272b…

MALICIOUS

PDF

92.6 KB Created: 2021-09-06 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26bcfdb2e880388eeec7c7a2fc24b926 SHA-1: 8fb6edf3921f96bd3aa23a16f8c66951ef8bc1fd SHA-256: 9dbb7a8f29b1272bbfe165283b9b2e4eb1fa1f95287e9f628df01cbd02e94393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm used to distribute further malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://harrisitalia.it/uploads/file/dorebabaxox.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/41432202953.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/35312307847.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/7464212560.pdfIn PDF document text
    • https://biocoils.com/img/file/19340450257.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0e16ce19---gaxofikorekoviletovemusa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a4e33f04---mirofa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e49e590fa---mogadaxolexi.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/74848035654.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/joleribemovat.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/35787557025.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b58c70b2---sepegesokebik.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/13606934625.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76e8633e68---63844335621.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/27450757276.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/kogapirerulasale.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/vinaxobak.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/5c5f251d2b971b7339611ea9718b60dd/39246156057.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cfjpmh3b4h5apf7q7p5g3b2cs0/13726619658.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4e69dcb84ffac2b9cbb5cad9318f765/luxanavipenuxememewaxe.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/08ff44eecdd82bb5d7181d1e680bce0f/penebigemuwoxasav.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a187b48313---nifuxogasini.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace13b3ad1---tozepi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/383kfu81f3tgvls1nmb3c9s0i1/puwubimijogimajebobod.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a999afe8b4dd01483c326d94f0db2378/kebogibupekaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+importance+of+%27big+data%27+a+definition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 10988 bytes
SHA-256: 9fa6462cb9e67f6b96e2e3a75115ccd72e73b0e5c482b03394c3e816414fc26a
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 18324 bytes
SHA-256: ef9f6437afa54002e8add7955ea3ca52539ca8b3908cbecbc622185d172d9925
font_03_sfnt_off00015a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A3E 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d

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