Malicious PDF — malware analysis report

Static analysis result for SHA-256 77aa7dce4db56cd4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 19:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4652b09ea23873fd1c122715dea5ed7c SHA-1: 0e9a9f3487a61523fbdcc01dfceeeab362076d6a SHA-256: 77aa7dce4db56cd47b8fbbab41cf8655bcd801664805bc7fd38aeee36924dc3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ahlhy.com/uploads/file/191907046017.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5cde8fac---kujopojotunojoxobapaw.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109190412153293.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87991827792.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/rurinuwejalokiluninokas.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/6943746717.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/17727335110.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/34307757407.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/vawililuxanesotozu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/12026898282.pdfIn PDF document text
    • http://szpk.hu/_user/file/63087206478.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/24855122227.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e2b673f8---8335482581.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sepuriketepufej.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87d737031f0c9ff4d782eca6b92a742e/95134965781.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zulusumor.pdfIn PDF document text
    • http://chengzechem.com/upload/files/66253978214.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/95189164507.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/mumonukanetesefofasaru.pdfIn PDF document text
    • http://qdjshg.com/files/file/xubodobegozujikul.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lulok.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/jenutemas.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40221894572.pdfIn PDF document text
    • https://digireg.es/upload/16894718542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=friv+war+gamesPDF 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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10212 bytes
SHA-256: 29bf402dcee9ab2778d05a17e34511685247dda9c676956c558f339aebf65b8a
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17616 bytes
SHA-256: 32ba28fbb0580cbeb6e90c64759a97657f6f14ac6a76942d3366800089e1fd0e

Open this report in the interactive analyzer, or submit your own file for analysis.