Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56ebabf3fc6c655…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 325fd36d268e514f44ca9d9a00c2f852 SHA-1: 71f1a5153f0b2ddca9bc24f0359df7e8e7a991fd SHA-256: b56ebabf3fc6c65593f8c3c5880ba7fed44e5ce68a091fcab7c034f4770346d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics and compromised CMS upload links reinforces the nature of this file as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://krisoc.ru/uplcv?utm_term=magazine+maker+app+for+android PDF link annotation
    • http://proclima-membranes.ru/userfiles/file/14431059700.pdfIn PDF document text
    • https://kaimano.it/file/zomijerexurekasinuj.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324404d3dcc---93196570026.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/6350265220.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/divofu.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jilenevajujobix.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b69797de5d925f2b3509bb0fb870c01a/37843433877.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/afba0914753e327aab9aaf3525f0847a/xutuledumolumarirusanosek.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/doxovo.pdfIn PDF document text
    • https://terracell.pt/images/file/86923360947.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/28853934623.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_123709_156.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090201213655.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109050711344710.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/51371904509.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/86e001bc1abe89a638e1d2b8144011a7/59231699323.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nirokozovaxojowefuninezur.pdfIn PDF document text
    • http://wajl.net/img/file/202197211959.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/99074595869.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/28972462614.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zupexalavurokabozabele.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/59830362763.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/nufezasunosonazadam.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cs1g1mldptua26hgh2k846ev5j/ragigiwigifowakugimowam.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nemevojumiw.pdfIn PDF document text
    • https://songhongresort.com/img/files/vejasijilinalaxiwobukel.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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 17284 bytes
SHA-256: 1d85b093a56de6189ba05c9b2d3295230b33cb3442fb4a4d9d2383f00068c0c1
font_01_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10676 bytes
SHA-256: c0ec13e3590c9081c7fec0d23201cecb5ae4cd9572e336e1b43fe3070ab345a4
font_02_sfnt_off00013c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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