Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61ab8e914e9a080…

MALICIOUS

PDF

83.4 KB Created: 2021-06-05 22:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d87f963a1f1cb5058e4688b018f7ec2e SHA-1: 045e7137a62356c5fe144002ff8828de94a48097 SHA-256: c61ab8e914e9a080b46461fdcffcf5f605259b777fcfe65212275c0fd12e34f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use URL parameters suggestive of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirecting to malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=devi+bhagwat+puran+in+sanskrit+with+hindi+translation+pdf PDF link annotation
    • http://aelma.com/sites/default/userfiles/file/2061800291.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9e96fe96---49226925418.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/49f2f0c98f79cb1e9daa625fe7588741/rumuxutufefonigiwasago.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8c9a4bd77bc52c8c5beb0b1e5318bba9/wesajimobenibanakobol.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4faj16cqg8884fh41p2p9svflc/76934252126.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/39s16l8kfdgo36976qtorb19t7/90281034624.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160828a13dcbb5---dapulelasuluso.pdfIn PDF document text
    • https://mmszke.hu/files/file/xubabovojasomuvaletok.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985720f79---dokosufes.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/80911417268.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kavubosavanadawa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749712c52d5---rokiwenepujodi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nulagakojaxigomolodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 5656 bytes
SHA-256: 457b92d11a9a36bca5f2475ad34d9d976f68835e5972bf23a744152d69abc35e
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 12028 bytes
SHA-256: dc122bb172c34d002a05c65ba60e18ee85acb8b9d62e10c4034243fa66b96f45
font_02_sfnt_off0001321b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321B 3532 bytes
SHA-256: e1295675c7b2fc8519b2a586a449300fcc7ef20092ee87cd797e18a7202f0bc5