Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f04084e1e8b9a1b…

MALICIOUS

PDF

74.1 KB Created: 2021-07-13 10:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce9bba0ee3dd85a0c8831f12b7153e2f SHA-1: 6494867aee460f8cfa0a9d946b29fc839db925fb SHA-256: 5f04084e1e8b9a1bb80141f7b4c82bdb0610b7f95c9df79cb9646b480aad531e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://chia4kids.ru/ckfinder/userfiles/files/somebolirigulasapiwekon.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/3855570796.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/68c643babd1927201f70c566aa42adc3/fisolexizumavuzigigovij.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e237c71f709---91816462073.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lb0tc2lk7h76i7p3ckicn06vpg/wudadi.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/logeso.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de4c58bcb12---lavebasutadekem.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4d6e7f3472ac69f73185a5e4648fbe23/17211076729.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zifesuzapixitawufodosisot.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/gigejujigakefopeti.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac9e7ceb1---9869415754.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508163004537641.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/40b233aa35c07d229e14f338d1147731/95717767153.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/parirujil.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f9010e95f5a598bc2e590f3ae40b2ab2/lanezenofeli.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee2ed5dfc---lipikevebeliditin.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acc6d316c---temidozuwikew.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/lk6cfclpfj39pd175mme7cj9se/botavugizelojiradobudab.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/bapolumevusuziposevoni.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d3eec1c5---bokajijolawerurovanazatuj.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/76434221115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rover%27s+makeover+dog+groomingPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10684 bytes
SHA-256: 642164647446e255d3d740ac2579f6a902d96f1a40d1b25ca59f6ff06a07f8d3
font_02_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16352 bytes
SHA-256: a8f82a1a404a7ecb11ed63b59ca02107f1caa0614ce141a7836aca3d7607d614

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