Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9524e3b0585d02…

MALICIOUS

PDF

79.6 KB Created: 2021-06-28 03:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ac416651b61985eb7e703a3194cc70c SHA-1: 068cc69b704889828f4ac59de9839e56a498dbbd SHA-256: ea9524e3b0585d02bcbb7b81fb07b75597c7c1524ba0ada3421c88e9ef753536
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc70f27b4---darananefu.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d28d7a0e0c0db3d942e645e35cfd1ead/35499639642.pdf
    • https://producedepot.us/userfiles/files/28449434747.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607429510ef01---98972736146.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kmj3ehc20g6qudf90e31b7ojt1/fukovivol.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758023b0e78---ladiletilifadopid.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/cba94910cead8a8030e940e1217e4892/xigulegusezanexas.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b400e358---sobaxojatizawavetuzet.pdf
    • https://tomas-music.com/contents//files/rularapivojowavewusovix.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5ce94af84a1eae0bc59b0183679fbd93/biketeratiraderexowusul.pdf
    • http://lateonsettay-sachs.org/userfiles/file/wubujekikejunem.pdf
    • http://hublihorse.com/uploads/userfiles/files/63193526215.pdf
    • http://santeh.md/img/files/26369164045.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/cefabd4bbac22c08fcc289c998e2631f/3374419566.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078afe8b9289---jemarotirexu.pdf
    • http://bigandtallking.com/userfiles/file/98799746979.pdf
    • http://msiutilities.biz/documents/gifomanopuzuwetava.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c9efb5c99b40cb01864cdab715957c99/9105265654.pdf
    • http://obrienbuilders.com/userfiles/file/50656893724.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea94d7afd9---9540999217.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/29846e794ab5500b6e329bc525327d54/71766529335.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/kmv59ri1au63ht25loodrlqrb4/pubufumigajabob.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52ccf67428---17460375402.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5341c16fe---55197823432.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harry+potter+sexist
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 16792 bytes
font_01_sfnt_off0000edcd.bin
ac34fbc5bee894092a115dbddc9f32c0454131dc2a8e58acf101c0ec2f404656
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 17084 bytes
font_02_sfnt_off00011a06.bin
8cb70995c62da1cf24906aa4901afff46468fb236e9743cd91b00b6923052530
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A06 10300 bytes