Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78cdeaeae4852e6…

MALICIOUS

PDF

87.3 KB Created: 2021-10-06 00:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f6fd6760b87cdf2cd1cd680ee3d2848 SHA-1: 7a45d88f20c3e82af8290a8828468c9d88ef5b24 SHA-256: e78cdeaeae4852e6ea6429b98eccd285b9ddff34cdb2f5685057804d03f9fd4c
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate it's likely used as a lure, potentially for phishing or to download further payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3031

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://laborke.ru/uplcv?utm_term=making+clouds+in+photoshop PDF link annotation
    • http://www.ferm-matic.fr/upload/file/43177275561.pdfIn PDF document text
    • https://5uempat.com/contents/files/84255323946.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zolimazojepogajetavipu.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/89004055197.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/92862381184.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210912_131040_2428.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/44779367613.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/93197216769.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/75045663584.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/rawifelekujegumi.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/vurufupiv.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mujuxarezagixafusuf.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/mogivipegiku.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/dereb.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872967931---mevofuviwujadev.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0aebc11f44b243831a0605f57bb874af/wamufiwazirizodi.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/12507660385.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/vowezud.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/posajozoridifozusiwa.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/tubonanuganagoluvejaxipom.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/bisenisezajeme.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/72813481072.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/51fa17266ee43e29925bda619338eeb5/14670669228.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10744 bytes
SHA-256: a98c11ca26b2792faa230fb2d0e00af0228ffef596e47dc7cfa1f2485c80530b
font_01_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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