Malicious PDF — malware analysis report

Static analysis result for SHA-256 060b2407e23cb2aa…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 23:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37df47966f592bf2d8f5ad6f56ba5b84 SHA-1: 51fef9ca80d8bbf993f94d7ab96cf800f4a437ed SHA-256: 060b2407e23cb2aa58ce5e22542dfa8082fd5a0cdf1b315496ad6e175b315f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress installations and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/anrhmest6m0iad2m9osegjq9hl/85553251836.pdf In PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16082b41fb0de8---6611581371.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/17751566419.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801ac89248b---rujixalopak.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cf6dd16f---bagefepil.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e273d4b8eb---7206850647.pdfIn PDF document text
    • http://chinalabware.ru/d/files/41966318970.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb78008e99---wufovofukepi.pdfIn PDF document text
    • https://anjingliar.com/contents//files/devita.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/xorixiwo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf76b97823746bc9cb7956e1e5aa30b5/88164117137.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/45929777557.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e60bd32f4b2---rezutukefot.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29182210635.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c772ef499---tuwuvumopapuzif.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad837c5e854---zanisigekaromowu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/82010204556.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930436e3de3---gifafivomakupuza.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e343ac62---jenamalamebovapez.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/mizofagatesuz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80a78147a---namowigidezeg.pdfIn PDF document text
    • http://artside.org/data/temp/file/26981557535.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ed7e209f85b768374f40c99dce6a58fb/28653054261.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/66149510014.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aec188edc---banijiwamenezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=expectation+and+variance+of+uniform+distributionPDF 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_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 19404 bytes
SHA-256: 110a078e5c8fc21249423b64723741788e5774f509e9262c0ce62654c27dc6a0
font_01_sfnt_off00014a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A39 11128 bytes
SHA-256: 3ee739e79a4b922d5fc9211f24d14c7cb8129b2082b261617c534ae9a3a8cccb
font_02_sfnt_off0001640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1