Malicious PDF — malware analysis report

Static analysis result for SHA-256 773fd0dc9494461d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 21:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32b7db75185bc5cea9fe3a95f52b0d70 SHA-1: fd564c192ead952a93ecf9d8821dda3b25fd15aa SHA-256: 773fd0dc9494461dd7588abf5b9799babef6aed86ce57a4124bba72cd7aa9bd6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these compromised links indicates an attempt to leverage potentially vulnerable or malicious infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc85a9ece---kufirisupewevinawu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/05c57eeb4ab980ed6908d344d20f595d/59708818669.pdf
    • https://anandamsanyal.com/userfiles/file/fojesifapigomanodesodolap.pdf
    • http://sportsgarten.com/editorData/file/32091628821.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/b6uptpepa1dorijj92u8bq2eh5/nosuxekuzapasuwozi.pdf
    • http://mindentudor.hu/userfiles/file/8995051635.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8sehfvhsq5al6hdch66l611vk6/wabofatabasunozenobanajum.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3i54sial9nlig1scf5n2pntncc/39844711110.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873fa9b1bdf---samogasowok.pdf
    • http://zjlytl.com/images/upload/File/18101192430.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c071a1572767e68b2d83d649286fe7d2/9497686513.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/072906d46b9619e6f5041178c40d3272/3836832781.pdf
    • https://angelsforwarriors.org/userfiles/files/5828391512.pdf
    • http://bloomlight.pl/_bloom/file/pagixomutoxatoza.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/zelololorilajobesumaponeb.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771bb57e18e---sikawevudopixetaposizez.pdf
    • http://www.gdchgs.com/admin/img/files/wipumetaza.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1499abddbbdab1d491cb20f2e8fc5cc7/tegotesadak.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/pelufafomumedunogumeviva.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e4c2c723---lanonagojirag.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/77301712154.pdf
    • http://imi.vc/upload/files/zogepuxifexi.pdf
    • http://barudan.hk/UploadFile/file/20210527045050958.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210723064710.pdf
    • https://ihappywash.com/uploads/files/202108200037502952.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=financial+accounting+and+reporting+by+millan+pdf
    • 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_off0000e28e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 16792 bytes
font_01_sfnt_off0000faa5.bin
ee1cefa05ba02cf345c2dd4a7482b6b24237568e68e493a597a3ab74aaca28d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 11128 bytes
font_02_sfnt_off00011428.bin
2c51d849c0742adc0468c206c364c7b460c03814ec873ad18e1f1322b192650c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 16244 bytes