Malicious PDF — malware analysis report

Static analysis result for SHA-256 935522b586b0acc2…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 04:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad580ad79111bb70a375b60dbe9a0bb6 SHA-1: dd1cf0f03d96125023fbad92cf0233ece5ebb908 SHA-256: 935522b586b0acc21388b2b047dff8daddc655e16e795557e5d8ce57688975a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or are identified as disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ajivikafinance.com/userfiles/file/makinidixakalifonebeb.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/31246517458.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ba036a6015a---tepejubube.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/16566929526.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/8skvu4j385rgcfajn4h0ndjfi1/fomisagobagagujikaziji.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c38790707ba3c041dfb0a4b056bee17d/12149063312.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072981fdd2cf---72293996519.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089798c52e97---mulokikidusa.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wisimagudifapiwesumufonaz.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1d81a62005b5eb6cf1a2abed31bad99b/42531273593.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f31a3e55---45117434590.pdfIn PDF document text
    • http://simonide.org/userfiles/file/37132368218.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/27c962fca03f3aa186cbd6a19da272e3/44536530863.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa9i521j0j3sieolguqihajfom/508836223.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/4543324128.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/mefasidodumokavawuduz.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/wuwivuraxekafobomi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1eece211---71397678439.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/20413146350.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0906296ee5deae037add47dcddfb3fb9/jalit.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3eaabb68---woxenof.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd2104cd---zodagaketudowidavezekaras.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/50c9c74602a27f0eeec2291adccd8ef9/sakudot.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3a5ic8lckf6q039ig61lkmemns/71694616731.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/bodarulepunumudiwiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+save+to+pdf+from+printPDF 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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 10756 bytes
SHA-256: 7275c81faf92ff7f7015d3a1b21cc2bbc93fa452f281d5acee3bfafc236ec0a0
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 17156 bytes
SHA-256: 1c10aa59f60f8841d708154b8484614eef6083a9955a3464c2b3f765cda3e2e4

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