PDF malware analysis — malicious · e43ed6c958674b3c

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 13:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8aeedb7c515eb505a32e45649740e629 SHA-1: 2999f7f5d9608562aa5bf490ab7bfeb62a9deba1 SHA-256: e43ed6c958674b3c88441a6b3108d674ef5a0383323f96d817800acddd844bb2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=geometry+questions+for+gre+pdf PDF link annotation
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4521500b5d---37942597458.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7328ae41d4---84900731360.pdfIn PDF document text
- http://piazzademarini3ge.com/userfiles/files/bosametiwasemadidenole.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098868c38400---wofotatirulukotat.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/72ead836e277b867fe316ba60e0242b8/jikefavejatasovam.pdfIn PDF document text
- http://qiangka.com/ckfinder/userfiles/files/77911730511.pdfIn PDF document text
- http://ahchala.com/img/file/84189694969.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ai6h7l4obgfvlj082q8f6v4u5/pigatibebisikoza.pdfIn PDF document text
- https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121b82b6c2---27626851035.pdfIn PDF document text
- http://bigxra.com/uploadfile/file/2021051202032373499.pdfIn PDF document text
- http://logistra.fr/ressource/site-image/files/75810114537.pdfIn PDF document text
- http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/da777448bffa52fa877ceff19ea44dd7/56120987677.pdfIn PDF document text
- http://erdivigado.hu/userkepek/file/85453124198.pdfIn PDF document text
- https://barcelonacentremedic.cat/files/galeria/files/81003798575.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/jisisimenukabedarakas.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a515251e3---52923749973.pdfIn PDF document text
- https://sportnazona.bg/f/uploads/files/tobuzixaguk.pdfIn PDF document text
- http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7252cda023---11933357374.pdfIn PDF document text
- https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f6dccd40aa2381b89a64ffb980cf12ac/17805890401.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fh7vj2mkc51pctluturoc6k983/wejuluku.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612565ca27dc5---21912375320.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd49bf964f7594af45d57fc006c60c7f/zimexekowenetefagow.pdfIn PDF document text
- https://fereshtegan.net/basefile/fereshtegannet/files/15736331158.pdfIn PDF document text
- http://hocomesun.com/upload/xuzojelagonokawijabufe.pdfIn PDF document text
- http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.pdfIn PDF document text
- 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_off0000ec4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC4D	11032 bytes
SHA-256: `b94577f997a9277fe25176d584248199107049bfe3060e0629ebc65ec5daf617`
`font_01_sfnt_off00010582.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10582	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D94	19644 bytes
SHA-256: `9bb2371b1657f36c679008d63f19afca5bfe4a199dbcde520aab435b8cfc8c4b`

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