Malicious PDF — malware analysis report

Static analysis result for SHA-256 713d8baa04e9451d…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 20:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13e6773991706ae466ca9541a94f2bc1 SHA-1: dca72e52010a471e9d6664cd7f4a7f59991cc021 SHA-256: 713d8baa04e9451d63eb447e14fc103882f25667bc856dc66bb2674ceec22695
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=types+of+fork+spoon PDF link annotation
    • http://maihome.hu/admin1/file/17523980429.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5acf53342aa3608bd8899e7f155d7213/32612603809.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sujutuxogofinizejufitazat.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f62aeea6ad4da957a9e7628583da32a1/23320135162.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/585692f5c6c4d980bf419980d16b5d09/80438722565.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ui3gkq4lki3nt6skq13u8r1lb5/46583059672.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/09e647546d48ccb8d7a926ac8f0420d3/lomokufef.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/korunofeselepidukodozur.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/vijapomagimepusikofara.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/sofipoxoj.pdfIn PDF document text
    • http://qa-whg.net/upload/files/gidikij.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/bowukot.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d7a884fcdcbb68489fe22e01027a7c89/buwexukedo.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/pokolefurolewotulirez.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/6caa9f3f173e44d33fc04cfe235685e3/64621978282.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c010b51a4db---wuwegewifenutoba.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9182de366---67490888793.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/silelusajudujerifubesok.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/82119982940.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/gujukowofosilelevab.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/suetipgesknpq27vjv0ccbf5t6/80510435795.pdfIn PDF document text
    • https://makenie.com/upload/files/42856030511.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/xofaruzeminowenepumaj.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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 17980 bytes
SHA-256: 468229be7a99c7e230afb495c451a760c0a6de5e4e2a84d48e398691e28fca3d
font_02_sfnt_off00014d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3B 10124 bytes
SHA-256: 52488fa1105183d6efbbb39d5113335d1aad48dea063c86c9c0add25339e0cdf

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