Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf302e9cabc6c89d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 08:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ee50faedb7b660c9d2a56c418d0a73f SHA-1: 584bd1015efd74cb995c80d92696075715d7ec96 SHA-256: cf302e9cabc6c89dc516f94368c82ec8eff7b51b56d7258bb544eb11c50e4851
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc7216cae---9438770908.pdf In PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sozekekigovamubikolosut1631488644.pdfIn PDF document text
    • http://inica.org/files/file///8005185490.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5186b90cfea4acfd21caeb564bf23ed7/mujumojibide.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48951451415.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/waxedazasubigexurotijek.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274d9af33c---84564988740.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210911144436.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/zafirenusiju.pdfIn PDF document text
    • http://olympusflights.com/files/files/japogiv.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/81344956672.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/28857352286.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kuzosuxukisorabonorelije.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210904093316.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7152c4d11e39fbd5b584abb5ff416253/35379806905.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/pimev.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/47847135670.pdfIn PDF document text
    • https://medtek.vn/storage/file/zudavovu.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/656938516.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/malikebemegukamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+down+to+earth+online+123moviesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f2599af36f371e148821ecbd92ec461c/58045609576.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_off0000bfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE0 18092 bytes
SHA-256: 85719593d259d100d2cd0f429c842350a4da09f4fafbd17f238382e0be743e0d
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 11124 bytes
SHA-256: 362eb580bbb05881bebdf08c27e060735e094767daca44c21b0c531bd59df5c3
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1