Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee182d5615c61f8f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 03:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fcfd7c94f6f71ac6ca53ed290305edb SHA-1: 7912e440c04580a38f0feb44a7660864114f57a0 SHA-256: ee182d5615c61f8f2df0b54436e370e97db99449e4447d5fd59f449914ea1e51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=glofiish+x600+android PDF link annotation
    • https://babetravelling.com/ckfinder/userfiles2/files/vusipozitibana.pdfIn PDF document text
    • http://willbramephotography.com/likezotisafelelut.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/rimanarelami.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4f42f96109454fb69d1eb55989e6e829/56154521465.pdfIn PDF document text
    • http://cutskytools.com/d/files/mewete.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/t4rluiurbrp9q756p7gcgbu816/72354641431.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/5396802315.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/51266189403.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/3037094676.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/woxoxawativawelujefoba.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/retowuvujekikukaxaleb.pdfIn PDF document text
    • http://dsagco.com/Upload/file/45106939350.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/80759306968.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/99993444933.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109020210534165.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/41837280628.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sakemade.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/28112401667.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139858a3f910---miruvasa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5970eca7---sojurixekuzixuzawaz.pdfIn PDF document text
    • http://ymmicro.com/files/files/74531269776.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_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 10652 bytes
SHA-256: 75dc7d4e4b111cdeb74f58950430ee7789eec1565b04757fec9f7d53a4fe624e
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 21684 bytes
SHA-256: 9a531b1c700ba087a2457d933369bb9e9667eca2f61cec075be047bc3911aa3e
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1