Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4fddf43d8963f9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 18:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93d1b8db6370cb874d304ad5cbe6dd67 SHA-1: 28a72e3f1b132a64170c3ea3b50ae1be2b149ced SHA-256: ea4fddf43d8963f93a7fe0cfbec491ad6231a738529529c42b174c06334f9f1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were directly extracted, the PDF format and embedded URLs suggest potential for JavaScript execution or redirection to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevovemipatok.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5751810a1287ec911b8817c43e2c0212/2805624044.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/tebozepoxiregalekujawuro.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/121140f6b8a161da1e109ae8d30cd0c8/96487718029.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/vapiwawagiwonisojadej.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/gunogawowukakikofujoret.pdfIn PDF document text
    • http://104408017.linker.tw/files/xevopunobegu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/pagagilawapezezopibujoji.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/89446296810.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/89381676380.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/suvezofuwigokedosade.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/65452679857.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146df561ecbf---jabanumupesilevutel.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/13539743876.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vijomisiv.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/167790377061439792ac995.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/wupajopixu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db594d7c4a---fejuzisuwuvopafu.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/30762845608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+favorites+from+android+phonePDF 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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 17620 bytes
SHA-256: 3f3050718c320ff21295af67d007afae8511786cecb4def22799f896c8b80fb5
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 10860 bytes
SHA-256: 40a349bf0453d2706e09d06e3e6eb066a387528ba9b0f64843ba29a68751da07
font_02_sfnt_off00012e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1