Malicious PDF — malware analysis report

Static analysis result for SHA-256 18412f6ba6f0c9db…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 06:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a855f2a079277358000e6655965a5d0 SHA-1: f7445d60a8ed8561aa0d2a853344c510fd59bc21 SHA-256: 18412f6ba6f0c9dbeceb2ca2eabfc79de18641e395d5b6528c9ab8890a46c039
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=30+days+has+september+april+june+and+november PDF link annotation
    • https://cancelaria.pl/galeria/file/jitapele.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/43114732451.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2773d312f7ffb763155fc3d8f1d72a5d/80436477977.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd325d686---zufigunotupowos.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/80d7c8f070f34a8b93fda3e47e8b5113/9696597331.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160763663280de---safabibode.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/50213347103.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7d32dafe9---77705379707.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/nujujeguxagezov.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16126bc3a67deb---pikesixipaxivomeparab.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/movupusaxopifufik.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/levujigobago.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a56c0c694---gasonaj.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/sajajibijegagode.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/ponosomim.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/53958472374.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/74979778486.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/939ff6a896f3fd5ece35a9f6ddffbab8/96949133976.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/ninafibefigajididorapa.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/30245163181.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/vaxerafukigexejakebu.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/jumegeromebusuxoweka.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/legasawogekenibuginete.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6951392f36---fevaxosizarolepejedobuv.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_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 18312 bytes
SHA-256: 7a86c268821c88542ac2157f56ecd07f1cdd950a0dcd810d178e73fc0b382dca
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 11404 bytes
SHA-256: db10ef8b6f2a35b05ef6d39f18f13b50b704b4d44a0090739074f95b0aead18b
font_02_sfnt_off00012ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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