Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8be18fae03ad5d6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 08:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6826ef930731085db57ef6957c1c756 SHA-1: 2cc47d2c2ededd902ce21674038c5b39f52148f5 SHA-256: d8be18fae03ad5d61e2953c9fe017bb87be0782ddea7e0e33ffb1ab35145cbca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tasarimak.net/ckfinder/userfiles/files/mugemitibogojibamosozu.pdf In PDF document text
    • https://bushregenerators.net/userfiles/files/76362426682.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/sedefeligunezumemuloj.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/96838910325.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/49607475095.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1gqqhngpp6cfp7fef3b7899lg3/58437120371.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/194e18b7d95bce77871a502ac90ef534/jumoxor.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af192c4c3e---47659694885.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/90658219123.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fabos.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5830145254.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec1ebd10c9788fedb5b9fee10464242/junikefuzapek.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a08095051---33497964149.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/manotujufobonatubesup.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/xezebalemabopofo.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/jafewanapeteg.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210725_0D8D9A862226FCE1.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a69de64f761---62054704726.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16081874d8c6fd---kudutedimabogexasileporas.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7b56b0bdb1c4046e88631c9bc56db376/fibevoripul.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/zotuxekewudevozetemosog.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674136288d---bosewopi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161139be2451c5---23634399496.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe0e310625---dexemenolopo.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/tenosikukewozixenelaravad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=importance+of+interpersonal+communication+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 15672 bytes
SHA-256: 402ec650c80e76654e85c77ebdc902467dedf2ec079c6b72289fc2ea6518ceae
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10832 bytes
SHA-256: fbbdd562f3c23c9e246fec24bdca999074f9d657b85e49606b7e1b3d8785a022