Malicious PDF — malware analysis report

Static analysis result for SHA-256 e359ac74b001f2b8…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2065afd107476b7198aba8757bc6369 SHA-1: 98864fc31c1a550963d3af47f8c9d2064bcefb24 SHA-256: e359ac74b001f2b8e49fee43d977dfd879b799f6ddb28470b4f07cadbbaa4598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://coretry.ru/uplcv?utm_term=makhadzi+songs+2020 PDF link annotation
    • http://alumcity.ru/userfiles/file/lubomabaxisakiwalixudiz.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/pupiwa.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cefe4c584c90558989df5e88926559aa/tuxenarokogowejoruw.pdfIn PDF document text
    • https://magerp.org/upload/files/31396802385.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2ffcf27a---85024156883.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/38840067688.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/75034192333.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/13930660440.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/sexen.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/89205908670.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/daminefami.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rojabiwapomoli.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/17867647989.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/bakijul.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/jubidofoforizumep.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/fetikuzesidurijajoxos.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/momurur.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/90492350316.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eavve0c3r9oacibvrarg92pfj8/sosetogufaxojesumeli.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0beb2e9cec2816a11867e4ee3b2a2226/bomogugagitazita.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e03d118c---15016115785.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/vedisosupaxipaduxajoginut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 10536 bytes
SHA-256: a42b5a75730d734fb1c69b1d5b7779bacd74e137c12e6194825f4ddd2bd0d4eb
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 18772 bytes
SHA-256: 046fe0776cd7f4036c50310158d6c85f4e1cd2201ccfd8ac7142e3da5abd1acc
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 18828 bytes
SHA-256: 1c9a6af66dc6ded0f69f9fb05a38aa48604d94bafaa8291397b8423d676d1183

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