Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98f800745444c8d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 06:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d99189f5891a4b47623b4599ce866a09 SHA-1: fbaddda5944cd38cc499ebcc2f4ef09de9f075a2 SHA-256: f98f800745444c8da9492cf2f5fa4af0a03b4af1efe24ed27c4df530055ca4b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, with several pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external URLs, likely to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://interior-mark.com/ckfinder/userfiles/files/23762439959.pdf In PDF document text
    • http://dgjst.com/upfile/file/fefametafebubo.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wodupakonug.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/bopenodusipuwukexuv.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/xixixerudotusosugexuzowo.pdfIn PDF document text
    • http://boki.hu/editor_up/dutonisalasagapomosisil.pdfIn PDF document text
    • https://masihpt1.com/contents/files/20288552895.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/93267494709.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/95447480311.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/80420470136.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/fepaginanuw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed582b0cd8---21056840423.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/9836608077.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/58387347312.pdfIn PDF document text
    • https://mcsfood.com/images/file/saruzabufebiroxe.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/56576873625.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sikorul.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • https://lecachet.fr/docs/files/3669306693.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/7427164675.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e39dd9e96---90852378305.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f106ce7168---nuvutefoguverubit.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/pazenitosiruxorij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zombie+tsunami+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 10836 bytes
SHA-256: 9b86a42ee89f2c452bda49767f513e92087819e9870417696701da9363f2439c
font_01_sfnt_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 18928 bytes
SHA-256: 5573cff93f82deb50793f460de183e4333d79f28f278317a96866aa4e0589da1
font_02_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5