Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7cc12ae1cdf04…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 18:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92930bbb54790f2113f45e73032ded4d SHA-1: 16a0b73dd0b1ebb859b0eede11a2ee4a4aa4b48b SHA-256: 43a7cc12ae1cdf04b0e899c356ad30cb64947c32cbda84e962f2df5ad9cbf2f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=how+to+put+cinema+hd+on+firestick PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c20f2b973efecdcc454889c3900488d7/dotovusibunasupidutifetum.pdfIn PDF document text
    • http://altus.pl/userfiles/file/posobirusudusuridagate.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fg1p6piumriklca1qokdh97pc4/noluvisapodawa.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/54733154960.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/bibowefovafatujijeruxulox.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/57976421477.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/70992249587.pdfIn PDF document text
    • https://ms02bet.com/contents/files/lizolag.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/xagamu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/vigev.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/rupipujubakotaba.pdfIn PDF document text
    • http://modern-pro.ru/files/file/novasaw.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/19899894015.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d9bb7c33---saniperexexo.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/guburad.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-02-23-05-03-41.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/46959817839.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/95904865224.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/nofaxejefizev.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vigimijatolopokobot.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/lapujipidarabi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd7cd07fe8---99442465933.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/69617611999.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/32050315424.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/35615179961.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_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 17884 bytes
SHA-256: 3c59c2fdf38964b3fd155e005caf376e4f5caa1efd4b73760e2b1b6cee986903
font_02_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 11108 bytes
SHA-256: f07706a044f982678d83794f48c8795a2297e85c721903476ed299e6fcc71d32

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