Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89b5840aa57e473…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 10:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 516e8d1c4479f070ebed2763cefeb29b SHA-1: 5be77fd389775d8710d4cc4745d3fe7de185a11f SHA-256: e89b5840aa57e4731aca7def50693c98dc8088d4333696f9f9484450f5fd3570
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to exploit users through phishing or by directing them to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://lexuspolymers.com/assets/ckfinder/userfiles/files/zuresaxaxoligawi.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce4274fcfc---rugonu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16151329138356---725493744.pdfIn PDF document text
    • http://surtek.biz/image/files/20150407_153447.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/15686054558.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2b9b592c494e02c2e66f10cf12f36e6e/9275258499.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210909065444.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mosaporo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/79959456641.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dugevejugugi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a71a0783---71459043671.pdfIn PDF document text
    • https://ptogel2.com/contents/files/25703298503.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/444a0113198190ccd7130d4ab6c35db4/befigavo.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/xuzorof.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/84108280944.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/24068489499.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/58770915872.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/mapujabebijebekiju.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/zitojuk.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/wezemarojijanatulavilapa.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/98821216737.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eb8991bbd9969a7e602edacd95568ec9/84455774826.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/25002142849.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/26735051276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+kingroot+appPDF 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_off0000afbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBD 15084 bytes
SHA-256: 40d234be7a8f4214900714d4b4e2c9e51f9a690a46795827ee85709d2dbb0175
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10652 bytes
SHA-256: 4093efd55a107feceb16db70c4bde7b5def031e0a70cb42b94bfcbf28a4596f1
font_02_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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