Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae58f80c6ba9b6a4…

MALICIOUS

PDF

98.1 KB Created: 2021-06-27 09:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ad78aca002bd25b4f43c8a8d15402d8 SHA-1: 55eaa11f025e6195169f458ef930cb542b245f6d SHA-256: ae58f80c6ba9b6a4f1adb5dec194ee9db1f3b2cd345ee4438999508964592b20
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0ca72454---jarisopiwi.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b4bc7a034ad4d37553bef9ac55fcec65/jujokenevozitevuguno.pdf
    • https://advance-pack.com/editor_upload/file/fuzolefufabebenoregexek.pdf
    • http://funperm.ru/content/file/4957401686.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mia8fm6apefggjseneisil1bl6/55056382891.pdf
    • http://hrdiborice.cz/erucom1/files/files/20921880799.pdf
    • http://seyrimerdin.com/userfiles/file/wekozizonabat.pdf
    • http://leakefamilyreunion.com/clients/63964/File/bazasaxugom.pdf
    • https://yellowstonewildlife.com/43115789013.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caafc93ecee---kizugelunadezafurewol.pdf
    • http://interface-referencement.com/userfiles/file/nakozisez.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ace989a3---80118826672.pdf
    • http://liccuza.ro/stiri_files/file/19514966184.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2b934d11---83162036504.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90482c3266---sawidavataposezuta.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee7b87106---mufisubitikifusimenavale.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/87120149625.pdf
    • http://amirafouad.com/uploaded_files/file/90797433203.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/wuwafosupulopusu.pdf
    • https://ilmercatinosottocasa.com/file/55315881735.pdf
    • https://jetaime-shop.com/files/95417107825.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/73dd07d9f03fdc6783c2f6c6bc5ee01c/mosena.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dhjjuqb2qha62ieumuucdv6ua8/31797703106.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sdbentsjo678j6l59jd4bua4ar/92940421968.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887b15e8d74---jagofakamagej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=point+dume+hiking+trail
    • 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_off000119d8.bin
4e6124b78d8d685cdd6811a5a05486446cb70134d1bdb125327010ef2f2c2755
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D8 18028 bytes
font_01_sfnt_off00014957.bin
060e71ee49c6a5218d714c0153ad16715ef0f4881660441900c8315f02a2c38e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14957 10720 bytes
font_02_sfnt_off00016181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16181 16792 bytes