Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b474273973f76dc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 07:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbd293d87b0d6e4d1d75dbde3c04dc9f SHA-1: 5135753f31cb129770951ef2882b8402dff12897 SHA-256: 7b474273973f76dcb824fff1e768b9835cae449ffdb56bf08a891bbf5949f8f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=forza+castle+barn+find PDF link annotation
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161202ec483093---jubopinenoredub.pdfIn PDF document text
    • http://hanleyresources.com/images/bowikor.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/40a354a051e92f2ec87de4ff21c8f705/45456526704.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/vagesulakokezulosedim.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/3681018256.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/13086527600.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1a2424a9f2e0a1e90485f27a5cd5e8b/94674728134.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lkbqg2tevcfuv55dos9usgd505/15480572467.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0747f295b---winibabubo.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jagujositelozejutiwat.pdfIn PDF document text
    • http://pmke.cz/pictures/files/getegitijabadojatelojumi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7808898d6---gojomu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/15aec6b8beef7bd3d105a5c7c89e3f86/81287916044.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/bodexutejivolaxiru.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29c1c9f30---96853509242.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/93549786855.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kiloniwegosipalozoze.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ae795c6a20db02c7c8dc63fbb8f33a23/nitavi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210604064313716984.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/5993034357.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/16688864345.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/86197273976.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610848fff4019---99376145428.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/towujonedurivaxi.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a300f9ef241db48193bab52ed005423c/sogovapuxax.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tunoremanobavupanubikepad.pdfIn PDF document text
    • 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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 10644 bytes
SHA-256: ec9fde5dff27d625b007d6bd7edf4b25fa656097ae83ea3d47540815046152a7
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 17700 bytes
SHA-256: ef8b56bed7ebf7de7634143a4187ea70b9e8460e5b529b1e833a268c96c3785f
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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