PDF malware analysis — malicious · ac7cdf2870ba564b

MALICIOUS

PDF

74.6 KB Created: 2021-10-03 00:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: fde1cfdc4303220ab11df83ead9a2fe2 SHA-1: 36d0986d470e2e4eae928c91f3c26b445f96b729 SHA-256: ac7cdf2870ba564b0ecbde972d4b5e1bf059840f4e4c20102ecb175bcb232b1f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS uploads, and one specific URL that appears to be a redirector with UTM parameters. The document's structure suggests it functions as a link farm, likely intended to direct users to malicious websites for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

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://coretry.ru/uplcv?utm_term=getapk+market+your+source+for+android+apps PDF link annotation
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a289700576---40300379262.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/mejinowapumipavekobaxu.pdfIn PDF document text
- https://casadko.fr/userfiles/file/83324852751.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e537b9381c---topujixanazajuta.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v682pssls02h49v6rg72a31r9g/55818629423.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf652b1e85---wuditasukopipunifaxibupe.pdfIn PDF document text
- https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/belatakexudozekurujofevak.pdfIn PDF document text
- https://szabobuszberles.hu/files/files/sunovuvovijuxam.pdfIn PDF document text
- http://herium.net/FileData/ckfinder/files/20210927_C048A12AD71DE96F.pdfIn PDF document text
- http://andreuma.madteam.net/ckfinder/userfiles/files/gokakoweganarosemomalovu.pdfIn PDF document text
- https://kentacademymiango.com/userfiles/file/lopilujetikalabaletemopiz.pdfIn PDF document text
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614c23321fac3---miranoxefez.pdfIn PDF document text
- https://performanshost.com/calisma2/files/uploads/zejelokokikowi.pdfIn PDF document text
- http://bachova-terapia.sk/images/file/55441640564.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161543c48a98cb---73432573717.pdfIn PDF document text
- http://coconut.hu/userfiles/file/42752194572.pdfIn PDF document text
- http://bet-balance.com/userfiles/file/ralomutevijipetimef.pdfIn PDF document text
- https://zibarajabi.com/cache/fck_files/file/xagakivamow.pdfIn PDF document text
- http://barefoot.pl/userfiles/file/desitivog.pdfIn PDF document text
- http://zhuoxinlaw.com/userfiles/file/20210903004854_2142569112.pdfIn PDF document text
- https://ccs-corporation.com/ckfinder/userfiles/files/mufawapit.pdfIn PDF document text
- http://outspokenholland.com/userfiles/fckFile/20210901171952.pdfIn PDF document text
- https://keluargamimpi2.com/contents/files/8220323827.pdfIn PDF document text
- http://cichanski.com/Upload/file/fesivise.pdfIn PDF document text
- http://kartinatv.org/uploads/files/83066751599.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/99585811775.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_off0000bb13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB13	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d32a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD32A	11080 bytes
SHA-256: `bf8aa28a52236f9451fd4234667f307d55aa1d4e84dde5743af7f3fdcbe54d25`
`font_02_sfnt_off0000ed06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED06	17724 bytes
SHA-256: `66ca4e018443d7b4aacd87ecebd80273216556e75359a3de9a7d95be23d77ca6`

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