Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bc0c3587b510ef…

MALICIOUS

PDF

90.5 KB Created: 2021-08-14 09:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e8bad893748f843fdea917da6692ac29 SHA-1: bf2d71e1e2b5f2bd1d90b0472368e8da92a5ef5b SHA-256: 13bc0c3587b510efa4841dae3b74621ca0bee9e9cd07fb7fc8cf2dac7ee19404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=how+to+tell+what+year+my+pse+bow+is PDF link annotation
    • https://medtek.vn/storage/file/padukatumubatovu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/312adb241346562633855dbf02ad6250/sosiromufu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b24110ca---goveli.pdfIn PDF document text
    • http://denledmpe.com/upload/files/jusuwebonufulel.pdfIn PDF document text
    • https://arerp.kr/data/file///63052729726.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d99680b329d44934876871b2b37254f/61147472362.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/sotobavo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c3f8cpt63neaqodl1e4au850qa/roligubumu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/sosedenaxodonisoj.pdfIn PDF document text
    • https://landbar.com/upload/files/sokosefogedoniza.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/33707809995.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1f6a77c7---49219557682.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/161164a0dedf30---komafodavetedab.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bigenunugoviguladuxebani.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae101e3b46---lubenoluxafixorolok.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/figakuvunegiwefupani.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3e4656895e9322db93d351a77cc3e42b/98727211579.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954a55508e4---getibi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16108498a0ee58---delutixibobuses.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/nabumisipukawubaja.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dc286042e0392b6208cdf3202507f8d1/15330729237.pdfIn PDF document text
    • https://ka-base.no/images_students/files/23617846842.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/busoxiwomededikaro.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/65872996072.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_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10744 bytes
SHA-256: fa4c6bdbc455bae63df9bea21ac5dd4d5e74f87c1d21aa978fe214fea5c56e47
font_02_sfnt_off00012c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C83 17636 bytes
SHA-256: ce2a9fc358283f06b143ed39cbbf12c8ff5202f36e0759648d9e08c1e1e34a9e

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