Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be83cc764d77e59…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 22:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96ffd9bae44ce3839527d3ae6eb26603 SHA-1: 305e22c7b7c57351f42e0dd707a9cca703c9589a SHA-256: 9be83cc764d77e59d63fb55a3394718ee0e8e8a5dbd9d4f3dd0c45c334635807
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://dietmoiquangle.com/webroot/img/files/77333945845.pdf In PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/52501155814.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/98972186890.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/88679131586.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd010e9b6---34288173919.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210912140944_15zzat.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/39643846549.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/55854028543.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bff849751---bapijawibigojog.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/zixenuzebelututibev.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/pasapijow.pdfIn PDF document text
    • https://www.confirmedtour.com/files/namefanudase.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/joduv.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/modagotarid.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/genopesogifini.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/90695218688.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139269803c19---24490636330.pdfIn PDF document text
    • http://foxhill101.com/userimages/23322780840.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/muzejowimu.pdfIn PDF document text
    • https://kueapem.com/contents/files/49027959931.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/95629630952.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/kulebubijebarelijur.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/71050729254.pdfIn PDF document text
    • http://allasclub.com/campannas/file/99162759897.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lelowax.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131f891ba3a5---22532538495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stick+warriors+mod+apkPDF 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 10644 bytes
SHA-256: a82409244be961ddd5664a690840aa911ae2ecc4769eb7e1d7e11639ad6b9ee0
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11897 19016 bytes
SHA-256: 56361e9c0e19fe8eb442ef553095ea9c1cba9a16ff49ab9e5e87187bbe8afd2a

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