Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd97e4c461cd4c9d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 02:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6caf84f69df520bf91df9711a7abf636 SHA-1: 25a62474283155192ec538932db2bdd2ba95e972 SHA-256: cd97e4c461cd4c9d25ac8c925b93c52fc10ccf6c7fa881247ecbde0c9530bf81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of the 'SE_INVOICE_LURE' heuristic further supports the idea that the document is intended to deceive users into clicking these links, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://chcial.ru/uplcv?utm_term=rcm+chart+under+gst+pdf PDF link annotation
    • https://moiatakashta.com/userfiles/file/livazudewejixisam.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7efb3807c---gasorudopemusixozogesupa.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/5349442801.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/kologudomosukilevaziva.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d99bbab4a---sotowajon.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/18799545976.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210718130128_83dvbl.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/42362055488.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/mitasevopopaxonax.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vatogolozixiguforosomofa.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/bavasubupuwat.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1obaekvj24vj80cdtsud9blh2l/61645010693.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dogikoji.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f5651ceac28b133ab1f67d57dda0ffd4/90445861004.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c13cf0425a3ec96f59b24a584f14c421/sevekakiwegu.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/47817214756.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7niledpgna7imblijkeqs68bbk/nimetes.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/lulitevobanaru.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/29897509507.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fbf2a612---17300738361.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/979b8346a09545fa2443630489f84e97/reguzarufolewuwirusetekug.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/52897659312.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_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 16752 bytes
SHA-256: 109d14d9c09a593f70d96efd65cb52e2bff494ed4c75b8cd41596730e9fd04e2
font_01_sfnt_off00010644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 10952 bytes
SHA-256: 811239aed2dc0be373757299a9ab9a197b67bd60d810e0d10f9e478d14038e8b

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