Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27255a7cdd6f92d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 13:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa0f583dab91b36183e5f4f9144d89c9 SHA-1: 28104574617fa2e51b59d8854fae6dd5f303eeb7 SHA-256: f27255a7cdd6f92d3a27ba5b7f1a9d011ea9f5fa816802754cbdd23460d76e0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with numerous embedded URLs. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=android+bluetooth+disable+auto+connect PDF link annotation
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161421941d43e0---18690347874.pdfIn PDF document text
    • https://duel.pl/userfiles/file/zowodunaluvonu.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/63301224649.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/gowekajanak.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/rujexujusib.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/78751465188.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/6744554087.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/88494935759.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/gomamamuwemas.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/teburizefegezad.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/foxobixi.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/kuxakazunoxixabiwajikefo.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/totidodiniwosufagorakogaw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d1c9ba21---wepelupad.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9d108bce---21982407746.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/xozis.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/55125797979.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/45294897502.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109131849172386.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jexesezumasozajux.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/41923465249.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/luwuniribolegakixekib.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/mekes.pdfIn PDF document text
    • http://robedecreateur.com/img/files/xumiz.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/toradebifawotitomijas.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10688 bytes
SHA-256: 4fe21cc39560630ece696aade4f33f46de3b0de7d2cd7d6c888dc57271b18205
font_01_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 17936 bytes
SHA-256: 70da7908d5b87b314a2380b16e00350a727d672f6fd91b6baa4c0cfbad226764
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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