Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb8364bb52dc97a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 20:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e217f7d14914437784d5f1b11ecf237 SHA-1: d141408efbc9bef2c5e1f47e84fc55d086e8b72f SHA-256: fdb8364bb52dc97a235878a67dd9697179034a2c78ce77a81fc47c2e1daeb917
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to unknown or compromised domains, suggesting it's designed to lure users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://presentkompaniet.com/img/content/file/16164166579.pdf In PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wojirutebunujuxopoxanug.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/46985726453.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16321924565386.pdfIn PDF document text
    • http://espwireless.net/uploads/file/suruzapagatumusuraserag.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/58241837708.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/kcb6768pf9sj8caro7soo08257/dexezopodadomoxapikako.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/76019713832.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rirofurotofirefemuwime.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091903490584.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7caaf1ef---pudawokukatagepore.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c148a7f46489af0799f99b4dd10a7ba4/99763855704.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vagitedexewididoteg.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/bevuvedoxezixi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/20319933859.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/10989901448.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ff1aba4---gijufunepezorazoxajul.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139369d6a3bb---26910789542.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/xojumixuxowulapat.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/55941393702.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/10057539163.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/kukosaxoduwoba.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/51471018374.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/boduxadaxegokut.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/voravuban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pk+gupta+cell+biologyPDF 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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 15660 bytes
SHA-256: df81f47c29cce83178ce161d82e3feb5eb2754cb4dcd9577900e2dba32173f42
font_01_sfnt_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10624 bytes
SHA-256: 609a73caa16fadf2d1f46c32510dda9c80e98433b1f9a4b1a3c8b46bd6322813