Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06d77d7f4be6739…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 07:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e91052ac02957cc5fef0976667437eda SHA-1: 3e4494abe5eb0a72c5592951e6feb9d169b84f70 SHA-256: c06d77d7f4be67392f391c7fa47dbdb82adc39ec8134ea3116352de583bfd624
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://skene.es/userfiles/file/nisiravaroturimazo.pdf In PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/23666833604.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/90768649846.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/powaxarudevafikuribugega.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/82830599599.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/22510506798.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/doxerodizisaxu.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotimitular.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ee738b0a814ca7c1aa5a5a7d49e822ab/74396809019.pdfIn PDF document text
    • https://pindimana.in/uploads/file/2679523810.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/shfji3gesr4gdjcjh2pjnli6e3/10652412855.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/64a09e798ce8f0a72665f4a0e9684af7/38440272200.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c9144ef93---jasinakobek.pdfPDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/847846dbd3b580fa0d93da51ff34e7d6/38854337695.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/71cc3a97a74c7ab1b120426891247c9c/pupulemarovagotepe.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e5cc2209abe2f6e53b2f228f10f5f32e/dezogam.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/71099639613.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cf80212add563c5c71184647941b8a7e/24773890227.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/6671330961.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/80544755338.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/53477892594.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c9401e00---56370352081.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a170ec54d6e---dekulebotapoxuw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fdbd85098437c9580547111490df0efd/55764388694.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e917bb80e6---55505263070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=magnetic+effect+of+electric+current+class+10+cbse+notesPDF 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_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10916 bytes
SHA-256: 284a3be44ea58870113523e67c89e05887242ea3ea7349b97652661e482ec34e
font_01_sfnt_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 17908 bytes
SHA-256: 7c47f4c736631bd60798c8a2c27c6059a310ae85360ddeac07f553efcfdd833b
font_02_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1