Malicious PDF — malware analysis report

Static analysis result for SHA-256 741181fc81c95e75…

MALICIOUS

PDF

76.6 KB Created: 2021-07-26 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d01270cdf637e89ae7de96a2c93f3ea3 SHA-1: 91a5c935be7e4aab370862c07df968d8390cdbbd SHA-256: 741181fc81c95e7593fa04fc04dddff7e85d67106e7a8c5348bf21acac42ce4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often seen in spearphishing campaigns.

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://thuephotocopytaihanoi.com/upload/files/63506083911.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lh7524o6b4615ps8hhvlfvtkfo/xafeduxudimatedonasugima.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/kifonuvezamirupakigosowav.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/510113042.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/xofasa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8180da1c55c8da74f1c933120f9ca84d/zupopafazesanazadubewibe.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/4825268961.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebeb1fce0---furasaranapudu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/93444798990.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ead3a15c---4573302861.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a04e58014---88517076765.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2f0c3f13---getugiruzajimesidatota.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/86071332207.pdfIn PDF document text
    • https://j26clean.com/upload/files/sawosodofoteguzabakudowi.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/25270197891.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9cc50d8b2---gakeg.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/f97da7a0eed76e3f67e0bfb51fe68d9c/levimitebotibofenagulutew.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf160ce525a---xejuwiwuj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b71187d0c6163654c4a628d69ebc858f/zutaluwakukud.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/79606036023.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/lisejiselowuwuzodoma.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d788928c2f4---jegamevu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/39902907784.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/df3e53e9f30a0e5aafc9b6bd100283f5/lirevawobegudafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bal+geet+marathi+video+song+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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 11004 bytes
SHA-256: 6e41ba1f984347a586ce63d0ab458d5bbb88e71eeec7285fbdf73506f869162c
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 15960 bytes
SHA-256: 3955999c9b3f3426de1a807acee2521f5e412dd4d219678f3b0b8ef21238b56a
font_02_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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