Malicious PDF — malware analysis report

Static analysis result for SHA-256 168f8d838226a4e1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 22:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bda2422de2215de86d4af80bbd51c2b SHA-1: e5d789070e7300375f08f5ec26abc19c27e53225 SHA-256: 168f8d838226a4e10059e02d618a47efa290860e9a3b5fb3f0233c21f4fc31db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to domains associated with 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 related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613add8fc427f---zofivikegut.pdf In PDF document text
    • https://labelmarket.pl/data/file/mepemi.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/269789802.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jo66eb2dgbst245jso4gpc5j9v/96422599755.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/486211872.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/15993254194.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/59204267393.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/48316017323.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/28750706901.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/fetufizazutunak.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/6043504188.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/ropix.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/mifemiseb.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/98013376066.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/fejamaxumifonovelupijekak.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/sowaxaruluzinef.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f300ccae81---befubegewadinatizolapux.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d3d1d284d749fdc8a346d2dcb209cf2/jemuwimevabibiraropumup.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/buled.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/94035618024.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/68508383874.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/9590701294.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/ludepupuvisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=moana+full+movie+2016+free+onlinePDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 10732 bytes
SHA-256: b032bfb1acd1b2e6107980847e995e9536cf629b5fab33f19e623178f304d2e8
font_01_sfnt_off0000f0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AC 17188 bytes
SHA-256: fe96738ad41d10dd32dc8379b06d3ad216a4b65f7f9f5ae8c5965795e6ace4f0
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1