Malicious PDF — malware analysis report

Static analysis result for SHA-256 e287e6bc1143911c…

MALICIOUS

PDF

97.8 KB Created: 2021-08-18 18:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6741f6f49c50541e9a5fdb09038e5bff SHA-1: 48d4c621a2e70cd784efccd552e8553d285a9737 SHA-256: e287e6bc1143911cdf05e6f5b7904fee6820b209c1cad94a70eef9b412686886
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5b62aj6ousqcqesnf7c2tuvnr6/46646094238.pdf In PDF document text
    • http://nextgt.eu/uploads/file/femulumuvefuxuk.pdfIn PDF document text
    • https://digireg.pl/upload/17029944792.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021728110361995.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lesikenosev.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/678981744.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5746733a7eb273a53182b4797a7f0492/37724533857.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/92ddf8ceeea74ce224ecf6d02a379b47/vigazusisafavat.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e0b1b4a4276d5571046b78a206a04c62/burusifogenexifegat.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/kosewewisudejar.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624798244663203607.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lo5nrlub97klcnvct27onmj6vd/zureraku.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55165924b---duvesetuko.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1be610a59---xovewofenapawegukop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ad9ba4d5---roforawuxotupedilonur.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/simopefotepekove.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/sobijosofor.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210811_AB2B38EB61614146.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/59545105430.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/silirijetugunozufoweze.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/38593131528.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f983e286bf8b15860e4686bd38393131/22019252472.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624738622.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/poposobaxugumos.pdfIn PDF document text
    • http://atya.eu/files/file/85792183829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=do+they+both+die+in+the+notebookPDF 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_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 17564 bytes
SHA-256: ee17fd063947db965ce75b7374178b9315e9535188343427d19664bec01681fa
font_01_sfnt_off0001495a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495A 10216 bytes
SHA-256: 7bb2590533221ef8c92b2dae4b05ae4b7071e6492cf7a28d8439bc54b598998a
font_02_sfnt_off00016035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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