Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb7f5ef10a736d7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 16:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec97461a55b8a94fc11110d1120f401d SHA-1: 9fd81978ce2986310be1376673e1b712d92fbab0 SHA-256: 3fb7f5ef10a736d7fae645e15d520ea2e7c1495e88e9893f5b676e25e0340cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=raconter+un+souvenir+d%27enfance+marquant+pdf PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec5aae5be---posuvopifumimilom.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kivupotaxav.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/26779024673.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/jelovigaxekexesutiw.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/59052982526.pdfIn PDF document text
    • http://954move.com/clients/4890/File/43654550078.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113022f76906---zasel.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a051be5c5f0---zagividebiw.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qf5740naaubih1m9qt08puu8ft/27519002150.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b45f58a61---95289903057.pdfIn PDF document text
    • http://ezibra.pl/upload//file/70431991506.pdfIn PDF document text
    • http://mesterek.net/tmp/97531032229.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/wexukumexibe.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/zexikujo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9401d11d0eaf70ee39758cd0562d6f28/folabitasufagubopiduxuve.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/bimotuzigivi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a34806d9ed1---lifufowaregibajisolut.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210823_7A4A52BDD99DEA62.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zakemebitojigejexivef.pdfIn PDF document text
    • http://hotelhoanggiaminhchauquanlan.com/img-kskc/files/bodiwilene.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/fidozujufarokuravexelum.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/sawifekabekivaluxomuzu.pdfIn PDF document text
    • http://artside.org/data/temp/file/82405477611.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607abdaa9300f---mitusademolevefokejer.pdfIn PDF document text
    • 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_off0000ba11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 11128 bytes
SHA-256: b1cdf916e840427592bd6eec25308170f49c56ba275fefca6cead7e5ed5ce764
font_02_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16316 bytes
SHA-256: 5c565777ef8e724b94b42d9e67d75dd8b92bcdfae563d49ba8111189ed2efc81

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