Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5a5f3015d539ff…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a32a912a4c077cb7c5bf601aa1bc7ca SHA-1: 96ad397ba7fefe08852a388ac303792e919169b0 SHA-256: de5a5f3015d539ff9eca56472447e8955cb2ad3c305a0428e3e60a2550e507ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of UTM parameters in some URLs suggests a targeted campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://compufoxmail.com/userfiles/file/17607137604.pdf In PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/lonuxudifuz.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758214d9bbf---kefazujigevotogetake.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a369da33a66---xafimitaruvirunugobedikan.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a14b21717---11269885125.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073b38816308---gatiduj.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d3067e819a9---fuwum.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e874f79f61---movajimina.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/tepidala.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bcb29cca---98933823374.pdfIn PDF document text
    • https://kimansion.com/uploads/file/ropagalebu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/osddqita2ero77fbi621ia51ra/loguzaku.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nijukarebaniginilow.pdfIn PDF document text
    • http://climtech.com/files/files/sarazelewibisa.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/14326713099.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/05c8f33b51b55d9e68a7d3be5fa2f109/ravajigu.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/27567044818.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/81178095035.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/51763200055.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161164ec96c3c0---tukajulodeb.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9d3fcf6f5de4ad3ce5be9ae54406bec/gozuzibofosulumevozibode.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/jazudajemitimolumizila.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/4527757899.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/46484887480.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/28235957435.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/tedosoriru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=digora+optime+scanner+manualPDF 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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 19812 bytes
SHA-256: 69ec9185dcd3d0266e8ece72513eadb476a253418080a7c35fa4a4bb787fe4cb
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 10816 bytes
SHA-256: ae0da4dcec3e1aa0bceedbfb0191bf7c7576ca7323750f9fb8a452f3df4897a2
font_02_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1