Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc384f4beddea58…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 06:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff182bbe2d9d4342a22b01e807f03ee4 SHA-1: 47ed99fa9da78c1a9468cc71f2f7fd8d0f58b2c1 SHA-256: 3dc384f4beddea58071c75682393d020c584ce89b84921573e925fec973d7796
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://299-45.com/CKEdit/upload/files/17192263241.pdf In PDF document text
    • https://derfo.info/resimler/files/dezeremuxujiledu.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/bugupugigur.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mafedipupuwotexujolu.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/14481910866.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/xosusevutoxoxijovujopemi.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bodupab.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/kefivibapamanavizes.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/66960103750.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/loxogipawililakofunureno.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/subamo.pdfIn PDF document text
    • http://webbuilders.com/files/file/kobizubulaso.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136818d4f336---wododalelalaro.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/65682380901.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090200574718.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/dizawuwedan.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/negepin.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/taxamakuvijurujutikab.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f045b5c645---59384709470.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/tuxaboserepagodade.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/kijumoxek.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mgio4gfri83u23hjia45l0agv1/48234048237.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/zigerazuzikezojuwofem.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/32545415591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=speed+up+slow+android+tabletPDF 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_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10784 bytes
SHA-256: 85358f3a65087e3dfbffe18cd0e3d3141724ee24ac37db5a2596570804603eb6
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 18304 bytes
SHA-256: ebbe96b9d4acb77e4dab344d8941b0f9882da3e2ee1a9bfa8bd1de81a05de37f