Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ca342e38d844ac…

MALICIOUS

PDF

118.6 KB Created: 2021-06-21 02:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0128443f2f35347e9b40e03dabf96118 SHA-1: 4910bb65cfd49d99871c20a245a150b7979a1053 SHA-256: f1ca342e38d844ac83cd8f10b97b62c2c956999cc40ae72ea6ac445b84a1b9f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ebbba0e5---64177213138.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c81a82e618---22680397118.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073856b3bea9---11615604168.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7734960aa---95907553251.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090955455e57---34227084549.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bbb30f29---fegupexagesek.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/wazewagabuluwilajefe.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/60e915210df7641b98f7449172ce8ec5/53061269208.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd34222f6---72400211358.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3unpuai1jqo1f387g19ee4mep5/10730084528.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/534790cec4e8ac96464639a04f15127f/gisokabi.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fozibemigapegejaxo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b899ff654a4---21828915287.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4efb63db07d886fb5a1b08f39b6ff2b8/xevir.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+gold+wyverian+printPDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016643.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16643 11304 bytes
SHA-256: c86b08a5cbffea0ddca3ff6494863f9faf02804b2c5bbdaad22ff4ea4e95b234
stream_007_off0001b46d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B46D 16892 bytes
SHA-256: bda35855771b0d12f4cc5002abe378c5ef768869bb495d39d9f70b62ee71f1fb
font_00_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 11716 bytes
SHA-256: dbfe70cb6bac846e58370690148cbc0cfab565425ce94412632874c2da30aab0
font_01_sfnt_off0001548d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548D 5164 bytes
SHA-256: 2bc83ee8383610d5f512d5859dd30a2b2c3fc1b24c127f974cbc5a2f4a17ec16
font_03_sfnt_off00018668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18668 14396 bytes
SHA-256: e9dd98a7f07d14a8ba5678c5fbdb95bf508f846897720ee7c9f0cf02e3b2e1d3

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