Malicious PDF — malware analysis report

Static analysis result for SHA-256 145de35377b388cb…

MALICIOUS

PDF

94.0 KB Created: 2021-09-01 21:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e25a49c68a664566c5f7e5c4942f64dd SHA-1: 83f9071f8ee8d23cee14876319bfac8002c8a5dc SHA-256: 145de35377b388cbb860189149fbc4c8931d5a96d60bfe2eec6e851bd8ca931f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wastran.ru/uplcv?utm_term=what+does+crack+mean+in+spanish PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcf0d79ed---29029055099.pdfIn PDF document text
    • http://telektrans.hu/editor_up/dikadumolurasagesezaz.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kapomavidedipe.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d678d722b3d---12207614865.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2164a0ce0---sifavemekinun.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/15845597517.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210830235237.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c2be7d92448111f7ea7fe89f01f42a6d/worinebeka.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jesatonewinofap.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c71eefc74d7---baxibegixufojovak.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/junuzexoresag.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/kedusogababipogofaj.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085000c7ef---8869011980.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddcf358b66132b76d8b46534eeb027f1/ribosubumonalusa.pdfIn PDF document text
    • http://surtek.biz/image/files/20150118_051314.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fa08365a312---6909991596.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/42750093470.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/68138882180.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/65246913803.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efec1a7abf7---goziguwexozelimumodiliri.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/94e6306eff777ee1be772bc49403225d/54145711148.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8fdca00f31497689ca4ae826974d077b/zonigo.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/guzapemotiwub.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090da432a0cb---lebudipes.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/40435260796.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_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10816 bytes
SHA-256: d87c0fe23f33ef42fd34c4e35014867a98db8982429b689e141ac3a03eafdd32
font_01_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 20176 bytes
SHA-256: 07c5d04de5a205d76f8a620eec1025930331eb8fbf1ca496cdfd2bf82544d632

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