Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767810899a43a48…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 09:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc6f1ec2d85da566894b7fbce5b5b82d SHA-1: 4e584774013a99e0a3827429f8c2ec08484c4657 SHA-256: 9767810899a43a482b2e9888ba8a9863904a2f7f547f76ca8fe86977fa511f57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to a malicious site via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://shsuorui.com/uploadfiles/fckeditor/20210625/file/16246035048930.pdf In PDF document text
    • https://shatalarab-llc.net/userfiles/files/34604752490.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d48b764b---38563388053.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/73648689943.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/terizudir.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cc9319cd---58474725013.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/51446262880.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/ferevota.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacda0effc6---zamikuxatuxekuda.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/908362a040e4a1da3b36015e0f3510a0/tapot.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/setaku.pdfIn PDF document text
    • http://novichiha.ru/pic/file/pebisa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56cb77d9f2---duruxudubiririzikiwi.pdfIn PDF document text
    • https://aspirans.com/files/file/susutokekosakavononugil.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/kefabenibez.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210629_8CE3DBF0B7ECD8FB.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50651c50d---29167808758.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/25322204592.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/63656328161.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/81913615327.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/jikiwokumubolujadava.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/38860592925.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eeb68d0ed---7632697419.pdfIn PDF document text
    • https://ccskin.com/geektic/files/67460150965.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9b1df210---xitamarepikiwosipalonutut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clerk+of+works+interview+questions+and+answers+pdfPDF 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_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 11012 bytes
SHA-256: 3c762797ebe7657df67b75bfa4eddeb7ea0f6f82a97080c3f161810207f8537a
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 17248 bytes
SHA-256: 44b94eba64699679051c593b4c5cef0033753a625c3ca1f9f166372d39b63255

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