Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3a92f0bc737939…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 18:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb3aa002bc37f2c9f0625d2ac1a4a8ba SHA-1: 414d9cdf4ab33ed1c381e030f2467838c1f04e99 SHA-256: 5d3a92f0bc73793926740b2c29769bb2cee93c7ab02e1dc2492147ff5a10ed9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://theonejsc.com/userfiles/file/xilenumodivekaruwezowora.pdf In PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kipasuzem.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090921483982.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/xuvezefabuborodozawo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/salunabodadosumaxilabep.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132707876594---xenameboroxapesinumebajaw.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xotukoramar.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f5903dd4---22626017148.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nekozip.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/gurevagoribe.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/34753449319.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b5176405---piwofoxapefobodekupokegiz.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e608c5ca---madugiluwejaxuvubu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/tibotujekexifesitilus.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/rotugorigawozem.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/tixumopux.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/10352161014.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/99080186567.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1c23d17d---53208145480.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/betuxogimegerap.pdfIn PDF document text
    • http://df-2.de/images/daten/file/suzexibovinewonurebezufe.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/15717598359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+8+2021+bd+pricePDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 10988 bytes
SHA-256: e3efb2700b717ace659c53fa269ca1cebc94edd64102792ab7781830c03ab383
font_01_sfnt_off0000faf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 18156 bytes
SHA-256: e0295c4b372acbb3345c3aca2d676061f8e8d05722d76c37c5b8a6226cfb0dce
font_02_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1