Malicious PDF — malware analysis report

Static analysis result for SHA-256 e298b341601fd2d1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 736fdbda021348c5d1adcb790ee446ba SHA-1: 4992856982d7df3f93e6da92d0543e8d52e33fc3 SHA-256: e298b341601fd2d1335d33f4ecc5a2ec7104de460f0248fe82db33c6a33bb7f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish for credentials. The embedded JavaScript, though not fully detailed, is a common vector for further exploitation within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 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://ongxoanhdpe.vn/upload/files/javoguvexir.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/24076339829.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/rebosezoremejatotet.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a362b96---65924820372.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/1048823604.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109180817257012.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/sisimesujozekubusuvok.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911025409893151akxtgw.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f4b8638b---lapile.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/regoko.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ja979jk1jj3uu4d4trtrf1pprl/13996727385.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/19300841628.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/rufeduruviwevax.pdfIn PDF document text
    • https://totounited.com/contents/files/buzugujifiliruramijemite.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/4139669935.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/84172284445.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/22528011774.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/guvum.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/22243879556.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/46755476666.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2cee3e8---gowujapajesekafekev.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/30854630097.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/49366944523.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38896134126.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/fopomozi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/57705545410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=geometric+series+sum+formula+infinitePDF 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_off0000b74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 15472 bytes
SHA-256: a57abb94f840d823e6f29fc97b5ea87d7591202f97ba2431e45fe006581e23a7
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10636 bytes
SHA-256: 2d00070c3f289016e7be1530053eaefa1e9e060e42cea4d9a4c23dcaaabeeaef

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