Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0c46a9423d6775…

MALICIOUS

PDF

86.1 KB Created: 2021-09-05 07:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02c6ac194b02a5842baa403238756bb4 SHA-1: 11f434c0502baab5d43dfffd26ea2b8123a36d85 SHA-256: 8f0c46a9423d6775e22d90c6cfbc8901181e65d930f7a9af0dffe808b4e2b5fa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://belloverde.net/emailer/file/33413421618.pdf In PDF document text
    • http://cheapmarkt.com/userfiles/file/walonejazise.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/rogidomipugirofamobe.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/ruviwixad.pdfIn PDF document text
    • http://bjallstar.com/upload/file/bamemomorutevil.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/431555601b0a99470ac04421074d2014/15999938266.pdfIn PDF document text
    • http://mextro.de/upload/files/manorok.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xenuled.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/jabig.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/55901338881.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/86690006194.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dbded8f09---25699862018.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/fedotibukot.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7233f44123---nojotefodukawudedupesu.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/siniroter.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/kakifuzogumobutubuveg.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/buxawonejit.pdfIn PDF document text
    • http://synowka.pl/galeria/file/87734910243.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/44256406867.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/50796336833.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334ca57e95e---99646246234.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wuvix.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/e4jbm7peskpb22v1micgo00tik/63656188742.pdfIn PDF document text
    • http://beateromer.com/bilder/file/dakej.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/mfkovg9r9of4vqi6h1abg10paj/wevifamod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=firefly+rechargeable+mist+fan+manualPDF 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_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 18072 bytes
SHA-256: 43974de0fe0bbebc188be8d6c3b67784cf62974396bf375f45bd71e40c1ce389
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 10992 bytes
SHA-256: e8189d832662b0d167c157d9e8f9cb5f95cdf0e7fe119846f059477ec4780f6d