Malicious PDF — malware analysis report

Static analysis result for SHA-256 7667a45e3ab1c109…

MALICIOUS

PDF

89.9 KB Created: 2021-09-05 06:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a47c7c0f08c38de2c88560f53f31a030 SHA-1: 99838834a626c8ace5809785eb58a4c9137941f0 SHA-256: 7667a45e3ab1c10908d015c7e77c24d2a07324f77e4bc8408be66588bd23f0fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=principles+of+design+proportion+pdf PDF link annotation
    • http://domeinbeverdonk.be/assets/files/file/14633373049.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/limoxagasofopirafapuzasa.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/linarabilakumi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1704efda5c6626b91c049fe178f285d3/43884709351.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f76a80ea1---taraz.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/99859547079.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/58156205952.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4977d331c70bf90b990524533e3422bf/kagekuni.pdfIn PDF document text
    • https://jin-ji.com/upload/files/makiwulazigufof.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cad95729e---jalebokedazutez.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926e32b7bf---74468883582.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d1d1ec05392ebeb13ea95cbdb2256e2/89283261393.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607850de1773b---26834623132.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gghubim5su9n20a38hf8d540tc/zefonixupizegipadixurir.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/bizipawuwumowafe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/69829459365.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/2fc69571807ab40ea382b212b808c97e/gaxisekadaxemanadutixikol.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/11558997572.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/fotifupenug.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/dezegaxu.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/30179364941.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d08d2f2f0af---58654491415.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/xodorim.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_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10636 bytes
SHA-256: eebd1edb63249873b470d614eb96a35b0b9e02c92e30611ccef71b66e573fbcc
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 19240 bytes
SHA-256: 3c2efc6957eabba87b048d0bae036e950d648f174fbd3822c81db824ae6733c5

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