Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99af25afed27a97…

MALICIOUS

PDF

131.7 KB Created: 2021-06-22 18:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 344db7a7c9110d59a11154e93ce9af41 SHA-1: 5e96e00f0f984cbc9ba20886c7bc0c0bce9624ca SHA-256: f99af25afed27a9766d245f73286d9b70c79e96880356b852d47e275ec396a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress upload directories. These links likely serve to obscure the true destination and distribute further malicious content, such as phishing pages or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ee36576aea490e48cdf51e0b3070d423/30525737669.pdf In PDF document text
    • http://wellfoto.cz/pictures/files/xawagotideminejilexuga.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/tezaxawofuxeniteredu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ad48361e---71480668357.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bf62674f---jipitevekebe.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/16954309139.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9f62272d062edc9edaa1c985e4464cfb/kisopirenuzewunuxilevo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/knkd9qjl82f3061tg8k1rh2mpm/43254328391.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8e77b75fc30f59036db0642d753cbb40/74253764776.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820bc3b20d3---73972562708.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cfb7b164---6760364908.pdfIn PDF document text
    • http://fittbikese.hu/files/file/vefebik.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/12814325700.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8cc9260---37888673676.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/u9h1j5fr4oohutmj4ti3grm4ge/narun.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a2c885a7---bagemijimumuwusevujawom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=diseases+of+poultry+13th+editionPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c563.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C563 24528 bytes
SHA-256: 2c32366ef0d1449478259133a35f7123fa40b4978bd24b32d037ffe54fd85bf1
font_00_sfnt_off000189f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F2 5328 bytes
SHA-256: dd00e74ccbd61bfd0ce9618cacd601c87ceae21039d31ee703f4f90bfe8a03e0
font_01_sfnt_off00019c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C14 13280 bytes
SHA-256: e9d6f7d714b42bb6b41d724ce1ac7e2f147f4f3cb404662a2b7c39cfff94f984
font_03_sfnt_off0001f07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F07B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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