Malicious PDF — malware analysis report

Static analysis result for SHA-256 5362007fb45c68b2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 18:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbcde49419f2522f09e497a97c221060 SHA-1: d9f34f4c4351610385ba10e369e80bcef1ce80bb SHA-256: 5362007fb45c68b255eb03efd415479c728dc8fd9fdb524242afefef251cf0a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple disposable hosting domains, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133e950bbee9---98488870038.pdf In PDF document text
    • http://csp.hu/editor_up/buziwemavudavamoxegopegax.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b19864c8c8---vajafutezesuza.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16132173d8b8fc---98136342054.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fulosotagutigazepomozokab.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/sepos.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/62521278625.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41877516.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/32693484040.pdfIn PDF document text
    • http://sieuthibds.net/images/files/59035525381.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/41668635947.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/45334462338.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/sadibosatimolusagogori.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/vapagidux.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613773fb8d525---82510308183.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/rilig.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/duvuzum.pdfIn PDF document text
    • https://ibextrail.com/editor-images/35343497912.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0359760fc---juxiliwufasadamobazus.pdfIn PDF document text
    • http://iltorg.ru/upload/file/43759186942.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/76655325448.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/53877567535.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/26441921496.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/65297920809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=our+lady+of+sacred+heart+randwickPDF 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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 10992 bytes
SHA-256: 3dec5e0ec797e4583c52cabfd349d79ce547a5e7bff45decfffe806f893ad7c4
font_01_sfnt_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 17764 bytes
SHA-256: 2dc92a9178602f3f443e136d416ceb46c4ee966702f7be519016045c9980de50
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1