Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56cc40b994e7d8e…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 03:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc04f47360333009c10ab6a1b79597c2 SHA-1: 8bdb2fe187b03e4276ffc8bd440f2111d8412c64 SHA-256: f56cc40b994e7d8ed27bab42a1e18cccdcde6887a566f494ca9040e17a23b903
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://inter-travel.hu/_user/file/88111215901.pdf In PDF document text
    • https://datajournonepal.org/files/64232011353.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/67302366776.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/memukuniluzapi.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dodovapejojuruk.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/15869720344.pdfIn PDF document text
    • https://mbbs.hr/files/fonimewodufuzirukatogum.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b144df4471c1d4d50a818196e6290fa1/suvajumikarosaru.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/69414452842.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/bojuxibesivedezitodepeme.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/sijudowuzatiba.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9aba05c3---69392482790.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/48920614728.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56057914e6---66645514281.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4stgpf6b3a5ra78s0qsqf1i5bq/xobonugu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/6128073005.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a02eb80bf---21362759924.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/pobidoze.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hg664v9tqmacvmeieeeos93ng5/4471222210.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3cb73fd50c0ccd63a338c815f1b8d0af/xexis.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6jpjgpilds563d3kgf018qftp0/48487163575.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kkc6r8sdvhuffcp6h4pm88npuk/sitabokemejevibokapox.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/lisatoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+iv+for+android+downloadPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 10240 bytes
SHA-256: 56cf8e61c0a18aa7b41181546b6db39e6780644b890c1efc81dd3693f1824ca5
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 20500 bytes
SHA-256: 18fa86238098b5ea5d493bfa63de837ec9bbb802fce4617b1f229533c1d42512
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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