Malicious PDF — malware analysis report

Static analysis result for SHA-256 0353dfc0d2af036a…

MALICIOUS

PDF

70.5 KB Created: 2021-06-06 14:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 97e8534cb416d0113e7c4c1b3022305c SHA-1: a6398edfd8ffcafdfb054242c1f5f36ed536e3b4 SHA-256: 0353dfc0d2af036aa05ef36890b04188570e85e5975052bdedb9ff9c0ef30c3b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation and potentially encoded text, suggesting an attempt to disguise its malicious intent. The primary attack pattern observed is the use of a link farm to redirect users, likely towards phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=10.s%25C4%25B1n%25C4%25B1f+fizik+esen+yay%25C4%25B1nlar%25C4%25B1+konu+anlat%25C4%25B1ml%25C4%25B1+%25C3%25A7%25C3%25B6z%25C3%25BCmleri PDF link annotation
    • https://verandapattaya.com/userfiles/files/36541535524.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/89897647666.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/219107c7584206ed84cb33d1e1dc7b8f/15344036079.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add212df16a---tixolewoxevenudikereruwo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a43567cfcc5---48438993898.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/davidijalevigovideses.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1885353---19873508344.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b6df6f32c49633ec31884f6708861d5e/75358738655.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/rta6o0obuparmk8qatv84tnb54/21972248822.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ul8tu5ft7v1jh148rd8j798885/majobage.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e63478c98---zuvikajokobedebivuxer.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/kseongfg02cdabbvclps7v7l81/54975529436.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68f983a724---mutifoporimajagasixim.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/02dc21f10f68914bd5d7684f2aad2950/vifapoza.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/89538829116.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/kofegan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 5732 bytes
SHA-256: 9c7e7d8488ac889f922e08e85f63d6849a6b719aa5c0d4dd773bab4d459a558b
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 11872 bytes
SHA-256: f964554ba24a66ed3dbd1b8e60b6ce7d37fb626954b2e66f554d68f4f1b9d9d5