Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1d74e5711416a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 05:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b4e75a96eb12a2e7f635dadde1ba6b6 SHA-1: 91332a6325463fa6e76310e7470387f6a9d2e570 SHA-256: ecf1d74e5711416ad0c6122581f1e45ac97898aff3f159ef7b185ac3d3a4292d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe9e42f2c---magesexibenukaf.pdf In PDF document text
    • https://arerp.kr/data/file///fanunudirenibawid.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/dibidokobinenuzo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda592541f5---72809100318.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fad94f883---rizorodopo.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sozetuvararopexabe.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/30868805132.pdfIn PDF document text
    • https://schmitz.cz/res/file/tenanen.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66195bb15e---lezasovetukodowumusod.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/lamudo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/jariwuborozoxepugugul.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e66809ae---32829757137.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m6lknfauukj4co1mqc10eullpt/mewupisewoleloxasazuz.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/wasidadagilizofiguv.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2720d896---guzubat.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kipinigamomig.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/39451061499.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609703226c51e---99849754525.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-4/20210604183114772864.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/xamisipobuzufovogik.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/62791393832.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/96421781669.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/wiwazatesilar.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bodemumexuw.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160740ab7e174d---44698461588.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/15024818557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=interrogative+form+of+verb+to+bePDF 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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 10500 bytes
SHA-256: 07b6ee1378fb55b5f3addf6ce966c3960973399d0b43dc5113706511adc805f1
font_01_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 18052 bytes
SHA-256: ae1ec798eb13578dca1de70f53ecc1f06013384817d8fe1d84f0a13f847b9af3

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