Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ed30111d3d2de2…

MALICIOUS

PDF

80.2 KB Created: 2021-10-08 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ecb492854d1074b8c21c05440893c5f7 SHA-1: 4ebe2184fc629ebb6f1f234ca6b4800110d82a96 SHA-256: 27ed30111d3d2de2dd0f35c78e66dcecb40e301f69593d2d0496decc2019ed37
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, designed to redirect users to malicious content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links, likely leading to further malware download or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://plise.org/userfiles/file/pikerobeziguvofunuwidonu.pdf In PDF document text
    • https://mangonebike.com/uploads/file/58187395938.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c48251f3b---16330291556.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ooegh2alc4j5qjufncosrfq75c/16424497513.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/wonenedudibimogorezam.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/13221430641.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/puxabukigozemefebuzixobi.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/pajobetuj.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/wunudisifub.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/85580630700.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/83045027269.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/xobexu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/dafuxidakafedubixupo.pdfIn PDF document text
    • https://qkon.ca/images/file/7386077718.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/22215745295.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/80729372206.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140beb157c86---82589927939.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd581c474f---vikakerogumatikojalireja.pdfIn PDF document text
    • http://markone-tools.com/upload/files/miwebafijezudove.pdfIn PDF document text
    • http://skomi.ru/img/files/file/lurasenikulimaxamifatuzaf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9407bc385739d107b4d590a483956ea0/kagoguzire.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/54558040358.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155fb3a35cf9---pawakurukekux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+pdf+on+pure+water+business+planPDF 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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10796 bytes
SHA-256: 64069a62fd64edb0cc2452810d53859f5912c690b169f2933edc69dd71c5cf84
font_02_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 17604 bytes
SHA-256: 24c063497f2abd19abf4bae8e46ca2550de39154ffcf880d87b30242e25afce4

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