Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67c1594c006614b…

MALICIOUS

PDF

86.8 KB Created: 2021-08-09 09:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9fc31e5a31b38592ade7ac58996de061 SHA-1: 1837bfc5a2dcde7dc8d9f865be6df0937fd246f7 SHA-256: a67c1594c006614bef79620ecc4fa751e96e8db7141d0aeb4155c90e26f0ad08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=car+rental+system+project+proposal+pdf PDF link annotation
    • http://z500.si/files/90371387800.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/8382615341.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a9f2be91667ed81d121b4389b1eecb9c/sofujuk.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d50f14538582206f5de7514abd4904ad/sekidobimuniferusikek.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ho27gv3c913ob4tqo1m3jurpj5/kupimolewerilajo.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/85151532643.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160970e37cee14---65825218928.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607091c74b720---35750717383.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/mutitaxepexilim.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/35765070606.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xosopusijopaponigeka.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2nl4gr9u3b9t980n512tm1t3sv/29129300331.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/56698906161.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d6e99bdd94fb88a207f51a3d85835d65/56535403803.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kubuxuma.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/82729725754.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/5595341452.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/89b85484d86da9de9d79ef8c06797605/20355292101.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acecf36bfe7---fodojaxuk.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd67e5d95f---90004233185.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/ramajaxaza.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/62569347905.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jelarorizet.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/36631381591.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_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 17600 bytes
SHA-256: a98b1048af874f9abae1f5bed0366d4148ea324be1f6618524de4263212c5c00
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 10964 bytes
SHA-256: 1983754248137208478ba84b14292df156cfdc544be297a549762d84bf9ab290
font_02_sfnt_off0001353e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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