Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ac20e6aa117dea…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 18:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8924626d23ee07704336d39cf594d643 SHA-1: 14d2e1ffca5992f7dd1233e09c35311e023fae0b SHA-256: e9ac20e6aa117deaa77e9f7f3d2f6f73715bb73d69cde4a11c51b086a6d3d230
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many hosted on compromised WordPress sites, suggest the PDF is designed to redirect users to malicious content or phishing pages, likely serving as a lure for further compromise.

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 https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2mp9aeu3qruq32u3vdpt6r8ob0/84667102721.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/manogrb34h2hakm0dqbtuf5os4/putakawepokegokejawibawam.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iga2e14b8oromjt27ie9m86d91/19396451233.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94ea235ef---31289722554.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040e93ed35---28030145347.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b254deaeca9---96344109571.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1fca1edb1204f3ceeddc68d78c23a001/zajenogiwewexemudegoga.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/83bf00a41ab9bf8bfeff8da44bb6990a/80923125562.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///togasunatukugo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ee3e9b53a1ac251330c9e776fbc90506/tenufenoxapotixa.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983e980c08d---xodajesigilefiwumat.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19edc266ac---15318888147.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qum70me7864m62uvmpmt2f79u4/12445205052.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/36898582842.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f86a88faa---63359285329.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5cfbd60f4999a4e04acd72a0205e4354/xeputiziwoborizi.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/99bd5215523c1b1414bf76c32ae6e5c6/vukirojexetosufisal.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bee5c6138a4a308c6e5e6289ee0be51c/77950994491.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51746610664.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c6eab40b---10761074589.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/jirorewogenimot.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/werolufakenisuput.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/438041e958d9035b08837b51059d0ea9/tijugogunozedotazowobi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55b6b90ab---kukizuxurojilebuvi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc555ddfa---7074787680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=two+things+that+rhymePDF 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_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 10672 bytes
SHA-256: f6d8e3372a8f4c24f8f4517d257fadd5a933bb2b7ec7496f4251f66a6a11c8b2
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 17352 bytes
SHA-256: 9520a8f1d51836e75f05dacbda290d7acf46ea5799a884f56463046e799eeb13
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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