PDF malware analysis — malicious · b4ba6ccb10d3e76a

MALICIOUS

PDF

82.6 KB Created: 2021-07-17 19:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e91a33eb5f7caf6411d955c67a8c86d5 SHA-1: 4c02c26c94e83549927f0be213adce45364e7968 SHA-256: b4ba6ccb10d3e76ab9ea68a3222c21a0740a74862e9931530bea48f31e316f72

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely involving redirection to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://grandinhr.eu/images/user/file/wozixagibufemusumunodad.pdf In PDF document text
- http://trans-serwis.com/userfiles/file/tezolojowuwitotiganuv.pdfIn PDF document text
- http://tanphatinst.com/vietkiendo/upload/file/kusegi.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/teuc17sqrdb7heoostddniv5bb/70439270222.pdfIn PDF document text
- http://xsteelstock.com/d/files/sofofusolufibijigiko.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8b9afaaf4ee730cf85ab1c6c553caeb6/3286494512.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b88e1f85---zutebarimof.pdfIn PDF document text
- http://maxidmum.com/images/upload/fck/file/71156306085.pdfIn PDF document text
- https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/002126b903450c4a3a8eda3b278263d8/58651886256.pdfIn PDF document text
- https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eekk0rnos6ab1f3o1moiedcav7/26062384098.pdfIn PDF document text
- http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fukevajijemodipenek.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/vizefesifojivoxaruw.pdfIn PDF document text
- https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
- http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081036ee9044---pukenowiru.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb913f95b---1427260541.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e495a853---raboxisenipafobeniniz.pdfIn PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3a8d4545c424a6928ab4f270f2907f3d/18054486708.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a77dc6973---21036342844.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7013a4b9d---nobubujukukuwe.pdfIn PDF document text
- http://secretinvitation.net/images/files/83882467207.pdfIn PDF document text
- https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cde305053b684f34767cebbd492f454d/zegidonuvagajemewirotekab.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/80139894235.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/saterejufuxivefuxo.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608289fd9e0da---pexexukitugolinaken.pdfIn PDF document text
- http://capesociety.ca/uploads/files/zeximefajil.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+elevator+incident+asl+answersPDF 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_off0000ddc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5D8	10580 bytes
SHA-256: `3a2e21d49ae2efcb49b5afcf7449a85368f6019fb76c6245ce9d1e76dc0b02dc`
`font_02_sfnt_off00010e03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E03	17852 bytes
SHA-256: `985795f55a0215d32f5b3df0c11c96225d27bb16b64356d72d0d7b8e4a6fd0c7`

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