Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6f69eb73118ce2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 02:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fb570e7d3449321f5cb81b888a81864 SHA-1: 5b8aef30815a4dd4c67ce9ab4d46d3b137e82b23 SHA-256: 1a6f69eb73118ce28c1b5ca5117c5718e47af4f40a734ed7b37f54f4eefd9af2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious document, including multiple heuristic firings related to URL link farms and compromised CMS uploads. The presence of numerous external URIs, many pointing to potentially compromised WordPress installations, suggests an attempt to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612627a2acc31---75758379885.pdf In PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216261746539165.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/29636448679.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae7b0fa90---89663074554.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uukij7qgicstp8ff5bt56gdn43/daxiku.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/48474223738.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pb3igrcdrunoq33a2sl9fu1ngf/basisegeripororezenumit.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/82931719456.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a259bc85ae1---3513850461.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083acae3afc3---runudorurovipeverurabis.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bb9c45553---fesukogupusowok.pdfIn PDF document text
    • http://mp-journal.com/media/file/waderavarusiforiwuzemu.pdfIn PDF document text
    • http://chamdure.com/DATA/files/mebepimorago.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e9b412a9595da5c73c8cd11c4dea949f/namoderobemekusuromubu.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c77b149fa---80358475449.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/nikatijupevefis.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/35858940819.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d43hldm1cgnolr44qnag4n2lv5/72829143215.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c77292189f7d3f27ba5452d819139512/95189294250.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87440137231.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/65534904231.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dedda2f5c---ponavitemovepuv.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • http://agrion.org/upload/fichier/guxojomunowujikulewakep.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bekuranutogakapofonu.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/78203871715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blood+cholesterol+guidelines+2018+pdfPDF 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_off0000bb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 17492 bytes
SHA-256: c196d2dd65b8cefe76f8942c32448e2f9e350bf2178f34cb0423f7dad892c6e8
font_02_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 11392 bytes
SHA-256: fe3c1dfb09144fac84fc440782013253a5c9a9502449621846d2c430f08189da

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