Malicious PDF — malware analysis report

Static analysis result for SHA-256 10851543aa7b1d2e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-21 00:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11a54a22874ea63a2a795521d822f364 SHA-1: f3322d866484d91cd25d1dacd4e2a2b1b37c97b6 SHA-256: 10851543aa7b1d2e06b312822d20be0e2d9f952abc6218483d2cb7535480f3c6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted, and the document body was unreadable, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e19cd342---80297852341.pdf In PDF document text
    • http://guerrazzi.info/userfiles/files/ledenivovidi.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/9377008912.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/wibemabawenazapok.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jupobirejejufe.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/48806255643.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8be3534077af7998b43c85efea05256a/pefanug.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/67383393854.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091613454473499.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/38946028099.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/37191198577.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/10346237491.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/vusozexijarojapirigas.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/27597e0f59018033ad3ad707fbf8a0d0/woriruxugolavemelejizub.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905230453282118.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a50fb10fa3e68b5e2633baabd634a2b6/jazuzebepuvuwatevon.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/sekafufimedesowugiva.pdfIn PDF document text
    • http://apcmagon.com/userfiles/58089982551.pdfIn PDF document text
    • http://agro-partner.com/Image/files/bobilojoponorusibabukib.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/xavirakakur.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/568921596.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/linawifexukawamowo.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/vutivadikadopupupuzegegu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/43080b86982f54729722ad3e99c62a18/lazumapibumerij.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/xulinizesegiraror.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=movierulz+telugu+pagePDF link annotation
    • https://lapdonline.org/file/lonuj.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_off0000bd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 10372 bytes
SHA-256: bf841fce4bda97ac8ab6eda35f542ab6a533b40a863a3f9b313c48cb96243e81
font_02_sfnt_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 16532 bytes
SHA-256: 7c64b621b0247513d047662a4a2795732f2fdcf52ccb4fa6635c3292cdbd508f

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