Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e7cc9835e05f94…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 01:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b4729fcef3121b5a8d3b7b259ce6c80 SHA-1: fe7f07161ee3e5fa3f13ead4053c3e2a0a6bc795 SHA-256: 52e7cc9835e05f945fff8f259007a98fc223ef66860d78239f490ee48593e224
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://koryosushi.com/uploads/files/lafazobaxorubupunafegado.pdf In PDF document text
    • https://nenanhduong.vn/Upload/files/70683251808.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/20873488652.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ae8bfc571394af7f688dc04fa724c626/nusenipasogotilezogeb.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8a8564a3---90016479706.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611d82519dc37---sigonoxar.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/tijoxudewugapame.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zopidobavuxomusezobu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/4123123530.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2db6fb6f---wuzon.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e7nurn3eg8iiqpt653stv3hjb5/detivor.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/52440731629.pdfIn PDF document text
    • http://jfe.hk/userfiles/sikenesolotoraxu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/50995570333.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/77644790084.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/42301276421.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/7623173904.pdfIn PDF document text
    • https://go2germany.ru/files/file/samirirosigozovobot.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4412e2913---30169650576.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9bf066296374de3813d3fa598eeac8bf/wixulopog.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/natatevikebobu.pdfIn PDF document text
    • https://sanagustin.cl/files/60391091356.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b5875d4b---48227268546.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210718_F826A645046F377F.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161135ebad137d---44067738181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wedding+anniversary+wishes+in+english+for+sisterPDF 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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10892 bytes
SHA-256: 06c9731fbf36269f34ca097ad4d794ce74f074a0b814bd6c33e518bcdc510781
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 18240 bytes
SHA-256: 0284cb0966c1a96851611e2eafb5830d8b37e30dd6edcc6183e286fe0435708c

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