Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1632b089eacfbb2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 14:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 791f1a92181ea723bdd4e09a599113fd SHA-1: 868f8d8dfe0a1c03be2227ccd80f89e938c15fd6 SHA-256: e1632b089eacfbb27befed7bf28948e868458069bcd275b27017d4a7f2487861
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/qav24516f1tg197vpb74ik6amn/penukakixeg.pdf In PDF document text
    • http://ankurgroups.com/userfiles/file/wumozijib.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609216797725d---43606442243.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bdfcceb1---92612085719.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/00f1d97317cfbcce5ad537f918c247f7/xobevikipogesed.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/64269736572.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pikun.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/gugugelokaxofuxev.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/jezenanotitaxixugodeweru.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/47358681653.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/rukijobowifo.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/76597204777.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/disob.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/68419535942.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/53618282617.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e4aa9871a---visiledinegot.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/84149801550.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/9020726742.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ofc8lu7ljlt1d8mvpfr1sn0fp5/dawulivijotemegidagim.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/85mn8mlsh6gkkk8t6ib3t60da7/65607934874.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nezubox.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/19576474031.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kuvezigewopef.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88c0091a---94022397383.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ec202a6d---basisuwejudapuxuwukewunex.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/31850014159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=4th+grade+grammar+worksheets+types+of+sentencesPDF link annotation
    • 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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 15968 bytes
SHA-256: a0fe570a0d59688679f4bcde99a879896fcc07354990f5d793c7a49841fb8eac
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 11204 bytes
SHA-256: 16f05493885fdebcae941acdb34416c85300fd792c36610043cfdd9d5e29dc98

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