Malicious PDF — malware analysis report

Static analysis result for SHA-256 8878c659b4a63172…

MALICIOUS

PDF

89.5 KB Created: 2021-08-04 23:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45099e4069401dddb65f31f1e3092034 SHA-1: f1bd772004c3c621d998ec2656b41043229aabb9 SHA-256: 8878c659b4a63172bf245df9f7fc30fdfa75e64febb2fd0317ff4263bdf90b70
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate it impersonates a cloud document lure, likely to trick users into clicking on embedded links. Many of these links point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b125ee4e289---39124898263.pdf In PDF document text
    • http://notarbrazda.cz/userfiles/file/24989191641.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7ebg24mv84ps6r9beo3d1huc91/motusejeg.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/wemifiwexevadebisi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/56182915347.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bea37eb5d---5588797536.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/42819415483.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16086885a318a1---rugipazi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2e11fa49---tofixepevene.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a7208eb4---34380672074.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ce4ad5e0---40224897458.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/74300602143.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/waxafamibitake.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/76477402839.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/68171994999.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/87192646463.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743520767b6---lunaxajebikozakujopikos.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210729_144717.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29ac890ca---72824053917.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/21795191576.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/kdqtsq47dvatgejv6o1pevb1d5/zenixinoniruvuvet.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ssfh1mba85ou46hftm6aaakqbi/sedosivisaga.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/juxenukav.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/83315159108.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f074dd502e083b646563cedd95f88277/70086607929.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+google+drive+play+mp4PDF 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_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 17320 bytes
SHA-256: 790fa50723c6c8ec20ff528c6bfd838a7f5a293e02e33c4c724b108ee75053cb
font_02_sfnt_off00013f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5B 10756 bytes
SHA-256: b845ab4e9a3568453b2e47800ecf0646b21fa645f39804f23932a37defd07342

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