Malicious PDF — malware analysis report

Static analysis result for SHA-256 70306c1fb79aacc6…

MALICIOUS

PDF

86.2 KB Created: 2021-10-17 13:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e256829dcf6850b769f5df6d47e92175 SHA-1: d5b08186336243c4a4113d80fcc693ed3a816521 SHA-256: 70306c1fb79aacc6f7a01a9de0c167c4f337ef856fae1a92797fb7ea50502aeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=wood+innovation+and+design+centre PDF link annotation
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bizebiwim.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16164bac2e5865---wakevakin.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/jikotidimezowojesinom.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/luwalafixegona.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kutoxax.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/sexano.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_70E6F7664AAC2E2D.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3p37670mjgjk3drj2idm2mu1f6/gamuwewejag.pdfIn PDF document text
    • http://royalgroup.at/tmp/laduwij.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0698740001630564713.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/bobumuxozevani.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/40685863540.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/10636803568.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/mopaledukebigo.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/17699741892.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/tokefonepuwidup.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/danapokenezoz.pdfIn PDF document text
    • http://koddous.com/userfiles/file/48457649142.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/fovofidinenirivaju.pdfIn PDF document text
    • https://majubesar.com/contents/files/vevitusepowaju.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/govizajatutitanuma.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/49608538533.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3b46f044b697633eb0559f18af2a6a7d/36160836223.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/kixexifutogugujuga.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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 18344 bytes
SHA-256: a8401fe660a551eabd91af36ff28e8afbf404e89bfa2762ebea4de45645df42e
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 10556 bytes
SHA-256: 86ed83129c1c73bd43cea434e8a31fea3567d2b0927d9d42163dac8e9568a9b1
font_02_sfnt_off00013367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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