Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c592efe3bff843f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 18:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b70f7e856da4dee026085d3aae269ca SHA-1: 92b4d56b6a3f49255b2602a507355cbb4b258cf7 SHA-256: 8c592efe3bff843f5fb5bb5ee3a5cd91dcb74a551edb5a88c2fdf94ee0b1f1b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Multiple heuristics indicate the PDF contains a link farm pointing to various websites, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://roletyhanarol.pl/files/file/tutunupixafulep.pdf In PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/kaboxalalukibirivigidefe.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/94465447423.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/bd2c4125a52d9fa278caba2fd69ce7ed/1447390938.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/82ee8bb752f9c7d7e2594edcd5e279d1/degoziniz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ee17ccef---jemedejaroburobazim.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae444998f---zolaxemejuwane.pdfIn PDF document text
    • https://shibbirs.com/media/files/walesubazamogebib.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/89319830212.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kosawomel.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/kedopolutabuwerafo.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/23804178157.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sefezezosoz.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/bf380bdbde46f6079fffd5fc7b026666/10358912222.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/943917adb3abb57f0e4fd7b27edc4de5/20299117612.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2931ce9b38cf3e99949dd8d5d686f25d/gekab.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/degejadabavekejixaget.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/jedujapofanasololokeguwor.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/62407147301.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/37362457525.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6079c6c2e723cb9dab0b42431c6718cf/sikubijenanov.pdfIn PDF document text
    • http://liyangah.com/Upload/file/xebigipidamel.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rs8s3d60eqg4un5jajh5novc06/16459695037.pdfIn PDF document text
    • https://fishboat.hr/files/53554386069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+extractive+metallurgy+of+gold+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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 11140 bytes
SHA-256: 30771878d52a2e5a8613c3b67ddefc1ff513b470a1b4682ad2ada4783e407d7a
font_01_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 17872 bytes
SHA-256: fb88ad58c49101258301500fe208af535b61776309b9b2dfe6cdc5277ce786d1
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1