PDF malware analysis — malicious · b933308bf7e44946

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 13:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 14122fcded0595305354ba2e87757da8 SHA-1: 90cbcd177e27c8590f228e6fe352caccf31f966f SHA-256: b933308bf7e44946e51ea75902332296138783a88247e72e7b36a81abc6e734e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://fanti-fitness.pl/uploads/assets/file/17766897659.pdf In PDF document text
- https://mantyobras.com/userfiles/file/74008126275.pdfIn PDF document text
- http://ck-kutnahora.cz/gais/image/file/forubefojikenikerovoso.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161407ed13ed96---75103687220.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158a1a637---29210842744.pdfIn PDF document text
- https://floridainvestment.cz/files/file/3729426375.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614424053c633---turot.pdfIn PDF document text
- http://nriloan.jctoursandtravels.in/files/86205246274.pdfIn PDF document text
- http://indcms.testingmachines.com/images/file/20358203348.pdfIn PDF document text
- http://automyjka.pl/automyjka.pl/userfiles/file/duvunuzawimijugudixi.pdfIn PDF document text
- http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f590df36---dupanelewogekekugo.pdfIn PDF document text
- http://tamphuhiep.com/Images_upload/files/62767465341.pdfIn PDF document text
- http://niktid.ru/userfiles/file/pagufiwezonoxebex.pdfIn PDF document text
- http://girisimcilikproje.com/resimler/files/55107546782.pdfIn PDF document text
- http://supragyn.cz/userfiles/file/lemidujapasuzuj.pdfIn PDF document text
- https://livres-arts.com/ckfinder/userfiles/files/32282125641.pdfIn PDF document text
- https://ezastupitelstvo.sk/editor_uploads/system/files/43228866406.pdfIn PDF document text
- http://atut-biuro.com/uploaded/file/rexewijakew.pdfIn PDF document text
- https://ww150007.linebot.net/upfile/files/20210902093839.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/fc27c20b3fa3290283fbc7e488f959eb/talurapinexavovufole.pdfIn PDF document text
- https://m-astar.com/UserFiles/files/xotinafeguwakat.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161483f2558383---tagebupevitiworipo.pdfIn PDF document text
- http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/mezasivuso.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319c9bec5ef---90299307405.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=finding+nth+term+in+geometric+sequencePDF 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_off0000d533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD533	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ed45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED45	17248 bytes
SHA-256: `69d9620509345ef8c362f7484c034c875be4ebc7451ada5ecebf23156862b96f`
`font_02_sfnt_off00011a9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A9A	10832 bytes
SHA-256: `79e246266933dd769f9ff366c0719efcb4cb2e805f40a3ee1202e7d7060d45cf`

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