Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee990afde94665db…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 01:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4f072c6ff1cd3046ef74f12e89506f8c SHA-1: 22eb3476756b3de60e2c11ff49e3a6920f1e5b3e SHA-256: ee990afde94665dbd0e37ef7de36108004d64452a336b414c0d618a4502302a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://huntic.ru/uplcv?utm_term=ufc+2+android+apk PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5fd7a1a50---rafubopix.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/434b7350aa6a3ba14ddcc3e1332acb54/42408868670.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/83130405949.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/didetujepemidogigo.pdfIn PDF document text
    • http://mayjack.com/upload/files/makilagiturutuguluj.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375ff9960b6---18989621769.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fozuxukamiruvajesu.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/zazivudiranus.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wajubexosomuneze.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/20780603180.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/tejikafobijo.pdfIn PDF document text
    • http://sjanzee.nl/file/lorizupisek.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/rukosufadetulizixij.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/32784812834.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146657e3b5ce---9418150961.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/45086595218.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/18727741727.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/30588448068.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/loludozizosabutonasuwi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd440ec93f---zenobaxupureku.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/mitixurixabedawujibito.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jamotetizane.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/85240373033.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.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_off0000b9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 18396 bytes
SHA-256: 538a09cfffd8766c39a194f6d113f2d9afe7fa7f8430abdaa1af63e9ff999b68
font_01_sfnt_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 10388 bytes
SHA-256: d23945557042e9e0b4d87418ebaef8d80cf6a7b67d0c0d2f2ed17d98137e9d7f
font_02_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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