Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e571e6f57be36d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2febe5c786b271a13b8b9aef7536e8e5 SHA-1: dc54ccda826e547348c837cd59d4107fe8b85908 SHA-256: d3e571e6f57be36d73448ff9d94b23f2b8874105c78200548e042322ba8be29d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8a76db5df83aa201fbb159bda0da4018/13976697220.pdf In PDF document text
    • http://revize-elektro.info/UserFiles/File/bezivusakutovimenofo.pdfIn PDF document text
    • http://labotinnghia.com/img/files/93963293507.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/48523889341.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/57460507792.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/9073011001.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/45644877801.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/vavibeguwudi.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/35478136448.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/13149441783.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/lupijadinosinutanukuwawu.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/80014315335.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/13146151262.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1694efc1---mijikanomokipedokefi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/munotexopelidegaj.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/rerunibuzan.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/23441492932.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/75882912690.pdfIn PDF document text
    • http://turatabor.hu/media/xokabitobon.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d34ee2bac---kemavulawifasizozoze.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/74680907396.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mumitik.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/54874662317.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/fatukuvuzarukiduratabu.pdfIn PDF document text
    • https://qkon.ca/images/file/wiludez.pdfIn PDF document text
    • http://shamayachts.com/upload/file/85140869193.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425dc750711---13152269681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+season+1+episode+8PDF 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_off0000bbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC3 19360 bytes
SHA-256: 74fef763b3b19679e521e6a008a4b14059a97f37af3a8df54a45b7c28a11dabe
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10932 bytes
SHA-256: ca39520da16c3546e1426091fbddbd4bab6d5a7581fba87a61bef0dae86cc71d
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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