Malicious PDF — malware analysis report

Static analysis result for SHA-256 56efa41e60461c8a…

MALICIOUS

PDF

90.0 KB Created: 2021-08-27 04:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bc9e452f5d125ce780ce561b0983b26 SHA-1: e89a04d42ad30e062f09537cc0cdb038ff349818 SHA-256: 56efa41e60461c8ae45ba8f2bbf596a31bab5282d1fa16f0631b791487e1a8fc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and a high number of links. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, many pointing to compromised CMS uploads, suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b9b3662d---gazazosewepajebuleb.pdf In PDF document text
    • http://liavanhaeringen.nl/userfiles/files/verazitevexofudagotagodes.pdfIn PDF document text
    • https://wasael.com/userfiles/file/zerexivevonez.pdfIn PDF document text
    • https://bamor.org/userfiles/file/nimizi.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/95116001524.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2tt1ogepnbamqu7q76b28857ps/37907692007.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4aca4ee46ede0e94f6eddb3adf667c68/tewafebowitok.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/31466375828.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2135855113.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/zozutumutaw.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161174c951420d---xudoxak.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607decc0e16db---53996976720.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/38795497066.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/75887981488.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gejobitidobomiwudifokas.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/12947844837.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/lalagemubadu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/921576ae469a1478fbf7a7176a505501/23294828779.pdfIn PDF document text
    • http://446888.top/userfiles/file/nitasapi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/34be86079986f22bd3aaa15639cc6842/29789601606.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ep71siqj8e6uv6k3gfuav1qmdh/49735473936.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/rekotatolo.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/99qvmr2kfmgektjf8likhkfb9r/sikazakumavusojef.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/puresewelatanura.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/bovitidupasefuxujavaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unit+5+states+of+consciousness+answersPDF 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_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10612 bytes
SHA-256: f3d8fb890b58aba6848cb47dbcab1a9fa1bdb95945d31f39d2a6c15b17669474
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16876 bytes
SHA-256: 03453a08af49b061b05c4bd0dceb13c01d714596a66cc8b48dbf8cd993859019

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