PDF malware analysis — malicious · a8d2e119405a4026

MALICIOUS

PDF

179.7 KB Created: 2021-08-04 20:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5f5ca21a93ad4c83e2615edeb97f21ea SHA-1: e0ea01e95f7b1bad6f7e18bccf8388c967b6e4ba SHA-256: a8d2e119405a40269671188e95e6357399e5d45f7bd501316404f482bea01496

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.8148

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/cv73r8t4bb6ku83llu4lf9mjdm/85572545371.pdf In PDF document text
- http://matchedtubes.de/userfiles/file/31790253441.pdfIn PDF document text
- https://adlinefor.com/home/webagen/public_html/korn/data/file/72085819322.pdfIn PDF document text
- http://pkynfe.net/userfiles/file/zivoruj.pdfIn PDF document text
- https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/45ec731085ea22aeea66edbd13f039ef/53439442543.pdfIn PDF document text
- http://sunarfactory.com/userfiles/files/towazofogajatapebo.pdfIn PDF document text
- http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f5e16cdb---fedidojaramulominipav.pdfIn PDF document text
- http://targhevaticane.it/userfiles/files/marasotanigonifutifikided.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc049185c60---pojufanudatuwug.pdfIn PDF document text
- http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/54392444008.pdfIn PDF document text
- https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078c43e8194c---72794304832.pdfIn PDF document text
- https://lienlacanien.com/img_pages/file/33922879044.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/61111300832.pdfIn PDF document text
- https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/l4r6imj566hmbg5ot2o48jn0f2/97207581060.pdfIn PDF document text
- http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/53677345832.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f903250156---kuxonazukorobupafupuwel.pdfIn PDF document text
- http://france-ex.com/images/blog//file/lopozoronufabifoj.pdfIn PDF document text
- http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e776385b9b63c54c7000aecb0614c1d9/gakezevodusituvisotilorod.pdfIn PDF document text
- https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8js7n1d2nd5tc5fd9rocf2md0o/rujebakijirodekefo.pdfIn PDF document text
- http://szkolka-wiercioch.pl/files/file/duziluri.pdfIn PDF document text
- http://fmi.lu/userfiles/files/zobefoxuxuzoso.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5c99f584---27758371346.pdfIn PDF document text
- http://stefanourso.com/public/userfiles/file/22511142216.pdfIn PDF document text
- http://mispuntossaga.com/campannas/file/47389381591.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1e214e5b339b38f8475f0b7577ac769/ronawanojivegedovopowexin.pdfIn PDF document text
- http://izdo.org/img/userfiles/files/bajekezobarusebelevujude.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cambridge+igcse+biology+third+edition+answers+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off000257c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x257C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00026fda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x26FDA	19584 bytes
SHA-256: `0978c18f53736a4d3a2d8ef7248f6d2869e06772f14d0f16da295ce72de0b6b9`
`font_02_sfnt_off0002a47e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2A47E	11440 bytes
SHA-256: `f805be28df7d955a5dc9445119317cc24fec867007ab0df4e9736be1d2077098`

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