Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cefa4aeb5bd455…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0463b2b6278fdbde3bd9f5d2e6115574 SHA-1: 5f7d3e411f7eeeef9ab9dee5968d835df8245b53 SHA-256: 84cefa4aeb5bd455e5615f35cffc55807d5ebe81953a5e0dbd135d474cc7d468
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to lead users to malicious content. ClamAV and ML classifiers have also identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of these link farms suggests an attempt to lure users to external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/30161639039.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ba2edb99---jagofo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/49419dee7798e39febb303525ec1bb13/dulefidibigukulaw.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/sigojobojuzonosev.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca73868646---sorufuronazuregonel.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/tokuvawokumobutimawix.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071da08e1d8e---64256901007.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8ithe9uijr30kg2shaauhr5bn2/41821319760.pdfIn PDF document text
    • http://praguetransfer.com/files/file/maxudawosem.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/25456376070.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cfa055eec---42281916500.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/80998209738.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/23487026076.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/zugelitod.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/kofurusamedajubesutom.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fe5075301521a34806bc2fc8f90929ed/jiloruzilalunid.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/81352918409.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210603_EC972990AECF4CCE.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/43990661164.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719a9291e4c---jufiwidazibirowu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/firubudesejojiz.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/ropufo.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/xedekikireriwixiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=one+piece+ep+958PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 21428 bytes
SHA-256: cef609b9bbc97b456f658178a372668cace45b4f12d9d392b06ff713e59c8bb7
font_01_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB3 10208 bytes
SHA-256: 6766565306572a0caa481c7554f9a38b4703501e61eb762395d5b031de2727da
font_03_sfnt_off000153ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BA 4272 bytes
SHA-256: fcb529a65f1f9fbd508d973bf27d1c1af2520a88b1267df7a1fa804e8898fd2b

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