Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6def7e218bc340…

MALICIOUS

PDF

93.7 KB Created: 2021-09-16 10:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24d8d09b6700700ef9c857a5113b83a5 SHA-1: 0709912f63d0fb7553d5517983ba4c1bfd2563a8 SHA-256: ce6def7e218bc340b7edb077898dda3361ed158765a104b629d360a365ea9f63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised or disposable domains. The presence of multiple PDF link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • 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.
  • 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://itaxabc.com/userfiles/file/20210903155826_1501887117.pdf In PDF document text
    • http://sensi-leszno.pl/userfiles/file/9270413015.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/78406877824.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/vabibuvebejebuximowabenop.pdfIn PDF document text
    • https://umutfm.com/resimler/files/nukitekefuxisunosur.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/99794543496.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/8261101713.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/jitovijemuboxesajufiw.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614291040eb5b---runexugukedutebasuwanoxov.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136831064f79---35982923334.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/zogibipolorapirif.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/69046035369.pdfIn PDF document text
    • https://endobible.com/userfiles/file/xibevowenivemipasuso.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/85914542587.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q36kkl500jv748v34cfof71n76/gowuruti.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///falowizevebamerudolase.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5h93gvn8ibdq2mui8vvr2vsal9/defuzulupefimerobidotar.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/datazufalew.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kudonetexetamakivelaxilo.pdfIn PDF document text
    • http://lecostationery.com/files/file/wenuzivigowitomebupiv.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/37915609666.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fufusagu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dfd3d99076fc1e9b510675a211069c46/zewevotozi.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/86696085914.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/vutadukexidosoteje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=windows+7+sp1+64+bit+iso+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013a27.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A27 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 23680 bytes
SHA-256: f45cee8bba1dc9e01416da22f77f33f2af17ddb2d91733e20baa68bd41a691a7
font_01_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 10720 bytes
SHA-256: 98acd066b6ca31216008bca6fd9895682e2bc1a5eda06979e33d6ca3e51105ce
font_03_sfnt_off00015017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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