Malicious PDF — malware analysis report

Static analysis result for SHA-256 5320cf51d912f060…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 01:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c1632a4cce08b6814bad3a5195445c9 SHA-1: 8aba3bdc29fe22cf612655d0376ebfe6d3ae26ee SHA-256: 5320cf51d912f060cef7397b6b92b46032757c8b34c1d997d1e9a7b28229c48e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and link farms, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=how+to+take+off+a+ink+tag+on+clothes PDF link annotation
    • https://www.nevjegykiraly.hu/userfiles/files/nigapozilibimimupu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc9b48e32---22677281861.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gmd4cfeqvcqjllbc0mtc2sj4p8/22753447452.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a77bea98844---74789057619.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/70bedhe49o132ufsttho9an987/70939111075.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/gadokiliben.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210613060520.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/soriru.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8036eef80aef14be78bbc3db69b7fecc/54784520029.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/sowipenasimubufajagaliz.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/58820799122.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a440db315d---15748147474.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/61792152936.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/vizumaxovawutoviro.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092e57de90cf---daxisopokebekor.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/somefu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/62a1ae5a0b71af483120cf157250a69d/pemulekorejojopuzeriso.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1629a9bfa9c13132c103291de748414c/33886956073.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/19448767205.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/pixojimupebinebaxijiluv.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_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10684 bytes
SHA-256: e1148a6827f85b14be319c4e4a93668ba964c32a3a27228dd44e503c6c45011f
font_02_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 18048 bytes
SHA-256: 4d7dae7e89747b1a9884bf77a5fe35d13e527f6c10f584ab60b3b171d76922c5

Open this report in the interactive analyzer, or submit your own file for analysis.