Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7258e9895a3d759…

MALICIOUS

PDF

86.0 KB Created: 2021-08-16 18:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b94f0cfb954fd9e23441837794b0ca4a SHA-1: b71068390b7a8c68f2d26350745830a640100ff3 SHA-256: d7258e9895a3d7590026ef405ca5b219035f375c85ae6617ab877c65eb243079
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=magnitudes+vectoriales+ejercicios+resueltos+pdf PDF link annotation
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hds6np1jbj4cscpv9p9mcth8l0/74105466273.pdfIn PDF document text
    • http://faradbox.pl/files/file/18912409579.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/lulozi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/420a59fcd254dbfd66ddf4489465d2bb/ditudemopufunitejedelaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b281240519a---gawulolosigen.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9kqflbr1h3cu07lf7cur57cj15/61262683225.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2e87e2dbecd457bace916971b4dd8c75/giwuzelemugazazi.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/doguvife.pdfIn PDF document text
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/98121153618.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/52697664500.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2elrh74c9nor7klgpsg326gj4t/67471631163.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/4111096621.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28b456234a6d4561ef4569ba9275a98d/babin.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d7ee93e13---gamofufogodimolinonovipor.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f5172426---lejemudiwuga.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/69703129437.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/34264286737.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xedefa.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/4933502827.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/37463622096.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a23ee9515380fda9f19badf5e71b6112/vuwabevajalajon.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n6ttj52m8pbco0c20pgpgfrm72/rowovububureboluweto.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca224eed9---66467784180.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d6bb28cb36cb9bc23bc8d0c70b33e382/waduwetavomozib.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/45464306732.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04c275937---lubitetebelefopus.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 11084 bytes
SHA-256: ee4f6bb80be4f4af7959d3cbdd10599202b8c9ad469798bb630236db2c0b70f5
font_01_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 18260 bytes
SHA-256: 46840cf0caa3ef8806788a2022179c47c417b76007092b0a9281fdfcf79ce24f
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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