Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a98ae64b857d8ba…

MALICIOUS

PDF

84.3 KB Created: 2021-10-17 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1485ebbfbd836440e80fb5ffe67ac2e1 SHA-1: f0e512fd3b2d325f67fd1906d2966d7697406cbb SHA-256: 6a98ae64b857d8ba151afaebfd6339ec418c4e19b1b73252b2b237e196f379ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://straub-online.ch/userfiles/files/pelitu.pdf In PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/ditezino.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/vojamez.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/51428527293.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/vakifewiw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/s4cfbrdhb7o9co96r92rqgs3at/zefosubixotawixax.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/6089245185.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/9315363343.pdfIn PDF document text
    • https://sterlingsez.com/ckfinder/userfiles/files/26104725708.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/49592180475.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/65393721274.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/eh813nkum3oe2egl23cb0nk3s0/34480822316.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/905741e6c5fd3cb00a01bdc451e3e94b/bosibol.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/13200644477.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-9/20210909155922994796.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/rofipakixevuxemojet.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/golumobafumivosi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161646ec9ab7f8---jaxodareximemezerese.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/58026325807.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/jumosuvubovewiropuxujaxi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202110091515051223.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=appear+in+malayPDF 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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 17244 bytes
SHA-256: 48e050ddce50596a94ada1bc177eadad9b9fd2851231871cdb8c66b979002995
font_01_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 10124 bytes
SHA-256: da03c663345b5a630eb3407f5f60346e2246efb8856bdd1cce703d3c9a0bc29e
font_02_sfnt_off00012c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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