Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5205944f343b277…

MALICIOUS

PDF

150.1 KB Created: 2021-06-29 23:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 499906309b7ef33eadd1a68b2b8c4b0c SHA-1: 3cf7d6cd7aa56fc99b0694fd74c453f1188cf892 SHA-256: a5205944f343b2771a4c55eacc71d56e4db5a4f2b56f3f28c346468f3cfdda33
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing recovery secrets or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://nomylo.ru/uplcv?utm_term=two+types+of+cryptography PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715805d9ca1---rudapokor.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608875a247fec---sejaka.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b0f07b96---18632554777.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1176a82d---54008452473.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6f946ee698ae66efe5f8de8e1cc985b9/67318060040.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34667a025---dajulidosaxiriromulo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/39406162344.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/o06tvo5ghragf9qvn9dt35kcbm/34761099039.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ljserrmpe2okfcuntsmfbg4j5j/sobezegujazona.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/23750147239.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/f53p7h1ku9k36segb7v2i22vat/ledemilirosobubuv.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/fa387a21d5eba686b8ea9f99af2264dd/43385226505.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/6848316526.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/gopavejedofaxovozepipe.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u6v05n81hscltfmfeu47bcqqv0/66317243837.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/36192193680.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5b2c5f62fe6875babf89d3328f5cb202/77688622725.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c890c54a0299f876641433703c57079a/derumevojikenenare.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/36306926150.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160814c2ca98a5---30981205817.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/95902472145.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/bajugigexanapusevili.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDCE 10680 bytes
SHA-256: 39678b84216aba82fb99e6c5dc0f72a9c9bac36ea3a34670a01610780f69297c
font_01_sfnt_off0001e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E69C 21292 bytes
SHA-256: ff6b0c90e7a9bd11d98630e169398708f98ee2e3b39b14990638ccc40b08079d
font_02_sfnt_off00021ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000234f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234F2 16124 bytes
SHA-256: 93b29e1aa41dd7d65c1c46ae3eee5ea0670c1dbfa55a9a2b9540f424e41e9159

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