Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98e4bd255705a97…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 10:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bd5e3b61d019ea22fcba3a9862677a7 SHA-1: 9dd16bfd20dde7b460b09a2316029035f8a46937 SHA-256: d98e4bd255705a97f7ae62184a735f09c69350a0e59a494d062546cb41e66bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://t-eamplus.de/web/editor/files/kedig.pdf In PDF document text
    • http://gr-chem.com/upload/files/53040158164.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/zufewopikozop.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca80f3eb0---96338405351.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/5607564829.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/64728563194.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/95062568518.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37442218003.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/guxoworakoget.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/95808266162.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/jimixigudo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133415d73c56---26625564805.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wewewagulurefadezi.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/nedax.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20909736---47659327721.pdfIn PDF document text
    • http://czminghe.com/upload/files/39242696588.pdfIn PDF document text
    • http://newo.ru/files/files/bisezutedazigo.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/69275823489.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/zurovividexatu.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/woroverudaborap.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/fidoluvegofabedelo.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/18270894139.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/20805151573.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/xegoletiberanemumisoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+install+apps+on+android+tv+boxPDF 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_off0000c0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CB 16308 bytes
SHA-256: c0cccec1337e6bf32e7389145a5909d35b311bb2aa3bf08fcd6762e801de6eb4
font_01_sfnt_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10636 bytes
SHA-256: 81fef750ca25aede16b772b0f6ec11462487416b70e55b57cf0d78d04302c5c8