Malicious PDF — malware analysis report

Static analysis result for SHA-256 534264d92f63349d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 12:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbe05d62a89edccc18a068cfeb45e1c7 SHA-1: c12e024e678c39fed787c7f2817ab73c14eca6f2 SHA-256: 534264d92f63349d7fc2cdb9735b2cc66fea129f37976d999253b846c33e7b26
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

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 https://drafthe.ru/uplcv?utm_term=duke+nukem+time+to+kill+ps1+rom PDF link annotation
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d1a629c9d---najaxezubeg.pdfIn PDF document text
    • http://goldmustang.com/files/files/56931437919.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qoitt593gj1ghskpdmlc4j88k5/xupejatosa.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/94676214139.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a2d606a21283e6238fa7f9d83edfa41b/97192280298.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/kuduzimutuzokumog.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/78579266483.pdfIn PDF document text
    • https://datajournonepal.org/files/suxobozozogerozo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130306638e03---xekukewegelax.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/tenegiv.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/dofeja.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4497321c---ritifatomuwimidebewepo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/30340934680.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/59242206692.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/wijuwofag.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88620955049.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210904_06F5D411BD2B88AD.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • https://artenika.pl/fck/file/jovoximerabowesabuwo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161461cfbc44a1---tisok.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0915/58ac9f2c7fd45b2764cc23a09738ab47.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/55061335512.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/bejutozisodifixu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce3b5e0c83e4d7e41af3bd9eaa3358fa/vinufemefime.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613319e60224f---nikagofaribovofuxeneguxol.pdfIn PDF document text
    • 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_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 10496 bytes
SHA-256: 581121436c9eee5d4d7bc03167a86a36434cf9c4e1a3848bab3d3f44c85c8d79
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 17692 bytes
SHA-256: d7717b0c9dd2ec3e4f0db409d306b60fd1bff47d5247dadf3a567199c9256760

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