Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a07747797354079…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 16:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be821b49388fa2e6752e6dcf9e536ec6 SHA-1: 35b6bcd8cf8bdf5ea3d24c28e47075c6573c50fb SHA-256: 9a077477973540799df1275838d5ca2165d09962280cfd513a859abc97129dcb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://resicolor.com/upload/files/87674258802.pdf In PDF document text
    • http://suliaok.com/v15/Upload/file/202195629556263.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341754419c9---7169376373.pdfIn PDF document text
    • https://vitanov.rs/files/7917447724.pdfIn PDF document text
    • https://revive.fashion/upload/files/78604930692.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nemiji.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xegeduj.pdfIn PDF document text
    • http://ilovestory.com/upload/file/tapakufapurobika.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/84153876503.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/65406340916.pdfIn PDF document text
    • http://frchem.cn/upload/files/sikevirujis.pdfIn PDF document text
    • http://kvrhousing.com/uploads/zeduronidekuret.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/risudavapeseripis.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906213752.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/24836542791.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/64503421491.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/lobufotanasudibevemoli.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4mcgidjbr572r4125h68i36edg/kozakirawes.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139a373c77b7---45393611867.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jorufubi.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/faxajumipifom.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tulesudexixowutowaso.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/sawuwe.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/90438222988.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/nijuxorumurunebopatazowu.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/10231825697.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/20518005004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=peter+dinklage+the+bossPDF 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_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 18248 bytes
SHA-256: 112155132a642a97209bc7d17334369ddad650c4ec894e15b45afd7e3db51a9b
font_02_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 10760 bytes
SHA-256: 7840593bbd96963fd6047e92b1881ac5e00fae3de9cefcd68a4b193d4f942f6c

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