Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84408482a925e0a…

MALICIOUS

PDF

96.6 KB Created: 2021-08-31 17:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb95cba6b1bb187d4c94b858e7e8e674 SHA-1: 1c4e9ef3eb418c8761df4a1b81454f7ef24f3c66 SHA-256: e84408482a925e0a4b076e406a67da491be86b487a8e5dcf9fba83e741494382
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4cb210eb12---69990480124.pdf In PDF document text
    • http://acgroupenterprise.com/userfiles/file/poxarabejed.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/mevadolurukatejetusiro.pdfIn PDF document text
    • http://retailcop.ca/files/65553372424.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/15391085380.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021080504170127.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/49169931803.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/64166415355.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/naxudajipuzoniwafuxixil.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/tatemufefade.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/nigupivefopusiduma.pdfIn PDF document text
    • http://metapolar.hu/tmp/zixopixev.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/defemavifulidedesuzoved.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/jasutux.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/10976869076.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/50929183810.pdfIn PDF document text
    • http://edallyshop.com/upload/files/93366154848.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/76746989273.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161273d12c9b37---49986325565.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/97c62cea8bbf922582485c4522b5b9f5/51812701637.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/rarajafipemuziz.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/6454287746.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nepoxolopasonijara.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/482e0150616adce9e1377bfd3ffcd608/97136739062.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/cq1rv038nkuvvcihl1pmc9va9v/37486403049.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/82196322928.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/16674e83dd9feede3288ea904830df15/gunumeje.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d9a7e72b3a8965bf74ab751b8e1d4cad/kofisefewav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baby+girl+laughing+quotesPDF 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_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 10940 bytes
SHA-256: 2f091b29df3626a7cacb51014a218bd6f2ca57a7ffb88a76a14edfd00aedec80
font_01_sfnt_off00012c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C48 18632 bytes
SHA-256: f68076307211163f5de071754e4d66306a72a76765e4a8fd0c1046ca141d1639
font_02_sfnt_off00015c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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