Malicious PDF — malware analysis report

Static analysis result for SHA-256 44705cba23d09fe6…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 14:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7de1d9ee62f8fed2c8206c8e85d3f3bf SHA-1: 5f4175e1e256834cc06667aeff20065bb36f9e07 SHA-256: 44705cba23d09fe68ac34289db91392af7a489f606d229dc804e900013b1ae82
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.alex-vasilkov.ru/images/wisdom/file/45275418225.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/836289990.pdfIn PDF document text
    • http://safetypath.net/cms_images/52131201898.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec896429002123b359d26ae205edbbff/gemanuvofimuzurubup.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhc57fb49glvnq7p1gtea7t105/16525925462.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/54106179508.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pudaranejubonumako.pdfIn PDF document text
    • https://basisnomor.com/contents/files/sugunukemagitepimelefitav.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2d1acdd14149bd6a52840f33049a788f/pebepogulur.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17712b4cc---52414035023.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/94487819554.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/32c359fe09dd70f36c54e6d773cae607/polonerugog.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/42016811262.pdfIn PDF document text
    • https://unitjaya.com/contents//files/fuwikuzonazazubufusu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080381770cf1---54039177762.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/1419570831.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc385cb25---57589412016.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e46b1950bc9ea40400c1ba1fe74faa97/33726003142.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b02661177c593cd2e011308d66703bd2/woziram.pdfIn PDF document text
    • http://huefpdf.org/upload/file/megeritesamokovom.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/lijusifitinatusojaweg.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/8933228864.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/tebana.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/30392e6d5f296c33f9fe3dc0df2d926a/78357644248.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d5e960ac3f---wogizerofewusodaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=groundwater+pdf+book+free+downloadPDF 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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 16824 bytes
SHA-256: e8fe5e128461d13f78a4ccdbed12761c178b435446e4542239e67099207ef2b6
font_01_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 10688 bytes
SHA-256: 5b03449a20d24f9151fcf668c7946854ee246e7555150ce3ed1e69c7f47b637c

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