Malicious PDF — malware analysis report

Static analysis result for SHA-256 410ef1ef8846c3b4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 15:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c9fec57eb1265f77ff7e2892e7a5938 SHA-1: 026abe4fdf20c4ae4abe578911f47d86e4da5a75 SHA-256: 410ef1ef8846c3b4e7baeaca7f44c1f3f0963c74bb98b4590482e388e6f7ccdf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware distribution lure. It functions as a link farm, presenting numerous URLs that point to compromised WordPress uploads and disposable domains. These links are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ansonseatery.com/uploads/files/dudivug.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/itgk4kfupamra3ks2skgp6c9uj/15049884607.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e858e3d7f59---sajugisifu.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/nilavedosamafimexifubu.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210823181816.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7t27vk6p9o5drisdhme2juhj32/wazojoridok.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dcaa09c07---debanaroregijiwadoxukip.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b24a69343---99082215927.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dd029ec9ab493de6d4c672cd9101b503/77010669691.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105161502246777314b9tfc.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6317a0b1d3bd3a5e34e2b32d7f53149d/57543415610.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108251100201765.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/82865537779.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/saseli.pdfIn PDF document text
    • http://119pump.net/d/files/42286369353.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/wedokepipasurimegeme.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e219d05b5b2c751f4a7df1c231aefd97/dozofoneguji.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/27269644489.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9772959d13---68877881842.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e92aa3112de9bd2282d40d495df8911c/32156308401.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-29/20210829120659363929.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/daguguwejiwabejes.pdfIn PDF document text
    • http://mp-journal.com/media/file/47104818612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+white+tiger+pdf+read+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_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 10656 bytes
SHA-256: 266dce5b8da4b551c64c35a11f984ba831184ed20e3772cffdfe85c396b597e6
font_01_sfnt_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 17348 bytes
SHA-256: 8e354a003b98c2fcd5c05131f49abe9e839791e881c316c32c60d105b2bdbc1a
font_02_sfnt_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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