Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9e847ef8403758…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 19:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1134be62d229307f49c1e0d90c56547f SHA-1: 207dd7b72e6f93cf3c9921efc738849850133ac3 SHA-256: 0f9e847ef8403758e55315f110527e0f1022b076667d52394f5e202e393189e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised infrastructure suggests a tactic to obscure the ultimate destination or to leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/47d377d707fee11f98e9225acd2ca39a/61273709221.pdf In PDF document text
    • http://hnspkjx.com/d/files/nixazubiruxogusodogeke.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa07f19d2d---vebes.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d62bf802ed4abf6ea528c1793d290b37/nimezebavusepexijurubep.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/17d1408ae6bf88a2d222a82d5d542b76/70092919532.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jemibiposifilibuzozitozu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8448119b3---suwozujise.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be5341f4174---30348842116.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade2422cc7---31006839456.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f48585ac23bd59287d6a27f85b2520e1/salelukabud.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/009baa0c47abde984ee9be2ce026e208/80791384766.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/50628130600.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/leluvebowuxazuzasajituba.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b323e4bc9c4---87894176930.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/15861363977.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210619054639.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa40cdd1df---27572383630.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5d35b8fb---pawopumamegomojokaku.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8rfbtggs1laonc2cnm5bn57t5j/xugeda.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0ec6670b840f7431ade00e5360c70325/18135511568.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/bewazijizuladekodutam.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/400f83e022795946a3fa2998d4ed4332/12320003073.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/jawokugabe.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5ec353c712073928c6d9f870dbe45994/3893328713.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c408f269---notagexubusexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=psychometric+testing+questions+and+answersPDF 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_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 16684 bytes
SHA-256: 31371eaaf089311b34017d28e91a889ee6c94f18b74f658021d47c6221a8646a
font_01_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 11220 bytes
SHA-256: e7d9cefce27b6c4d38f7a8f8563aa8a4b391f82b172e1b0b18c43eb279ac6e5a