Malicious PDF — malware analysis report

Static analysis result for SHA-256 62650e46931fff01…

MALICIOUS

PDF

82.2 KB Created: 2021-07-18 09:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7c9440b71eb9c387527e6adf3604989 SHA-1: 81df74084af83fe040a30fc4bef4bef5ecf651d1 SHA-256: 62650e46931fff019b88a7f71a690d055a597f828f2b69665a7ee7aff3b3a8f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e51555e1---50811027755.pdf In PDF document text
    • http://summitremodelinginc.com/userfiles/files/57127129284.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8e7b73c3a5---26951098710.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607178639d591---97125047579.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/jabajitivefitog.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7ee7eb0f0aaa7eec458659a935c203b1/46939781289.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7d3067ceccea1db31ce26516e77163cc/nidakepokus.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/776fcaf72d4756d95fa1b28b9c616cd4/71553990157.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/35861028903.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/wanawalekefomogen.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/351104325cd456aec9366638758d9644/wewijifosifugusodulolidi.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/biwoxow.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///21288774800.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/25892715323.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210615233233_y8rdtt.pdfIn PDF document text
    • http://ligneus.hu/upload/file/kuzelizakijalepikuxogub.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c8534c0aa---38787891380.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/tokifolosubef.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/n2c3ncvfk3n4j281p83mqk38h5/61200208325.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cebf199bb2ab380027d00363b02d676c/kawotojotodaboxogejefun.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/lalukejokij.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/33420359238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=one+thing+remains+bible+versePDF 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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 17108 bytes
SHA-256: 0f9e01611c4d4f10a9ae071dbba85d3dac0f11ccf1cb0c97f162558e2850ceb9
font_02_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 10668 bytes
SHA-256: f2e632249950b4aa720beed9519f9659649932e792337be743006fb8bb8353d3

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