Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af15334564e9d8f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 07:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c667fc8eadf47234bfb900cce8852fe SHA-1: 8d0edb9ac157eb208a4023be99df1c5a441b7fb3 SHA-256: 8af15334564e9d8ffc18e6132fe351c19953cf0039422743f9b93ca7b11344ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=international+mall+stores PDF link annotation
    • http://hersheyhigh1981.com/clients/37302/File/76075205864.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/dikipelokopi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210517050911.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/s21jm6bkmrojqkr54sonv3b6l3/31716898371.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/tasomotulaxide.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fb406de6209cfbe0b397c0767e51758f/29004260427.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8f1b5ae818896e048cf84b74f458c185/97720441122.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/13820026503.pdfIn PDF document text
    • http://boldogelet.hu/media/wigasopuvunawitigewesum.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b153d6543---pegomabasegufigosekob.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/472de16dc4ec7542b215b45ec50c5899/42827987022.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/konofuleka.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/31502998607.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc68b96b3---8962042807.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/85667870742.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e8d05db04---boxexesasig.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7sv7n2rucq8ci8kp4gdfvfki9u/kutaxomogos.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/24465747468.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/febojosevidig.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16099a04257466---71172095741.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fc26aa907de---70911264067.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/kegibixar.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/lotedeg.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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10220 bytes
SHA-256: e4c348a352eabdacef55554239920d40eb326a06d1dca76b29b0259974bcedb8
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 18268 bytes
SHA-256: 9dad78afd1e9adba0bf87b53f0f9345a2898d4321fcafce7d7a39d8e38704332

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