PDF malware analysis — malicious · f4ac621118fc4b0f

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 20:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 2a4b1b963693f4098e325295e6f60351 SHA-1: 9116b24cb6225f0969dc0dc4fdb3f9d38268422d SHA-256: f4ac621118fc4b0fb607225c360fd0899feaa92c5f7e607f6fb3a0aa70f953b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggests a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but reinforcing the malicious classification.

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://queure.ru/uplcv?utm_term=survey+methodology+2nd+edition+pdf PDF link annotation
- http://bachtungcompany.com/upload/files/diluwawogudavazujebipeba.pdfIn PDF document text
- http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/06e11d0u32j4f7mkt6q6p1rfn1/1653194545.pdfIn PDF document text
- https://nangluongvada.com/uploads/files/91132463396.pdfIn PDF document text
- https://yapluka-services.fr/userfiles/file/5628073018.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/653472306.pdfIn PDF document text
- https://31app.com/userfiles/file/58530601131.pdfIn PDF document text
- http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb0b09790---fobuwiradozenobuvefomet.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d9bb1da63---12246094761.pdfIn PDF document text
- https://prestinieurope.com/userfiles/files/maginu.pdfIn PDF document text
- http://altronic.pl/!mag2011/userfiles/file/roxikalugivefugewudas.pdfIn PDF document text
- https://questyme.ca/userfiles/file/rerusazipagufigozi.pdfIn PDF document text
- http://hk-keber.de/images/file/33427533548.pdfIn PDF document text
- http://studiophotosfashion.it/userfiles/files/rategan.pdfIn PDF document text
- http://unnatiwelfareorganization.com/ckfinder/userfiles/files/rofujeneb.pdfIn PDF document text
- https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909fa933ad1---xopiwidu.pdfIn PDF document text
- http://rogersdesignhouse.com/uploads/files/42059231408.pdfIn PDF document text
- https://kozmetikadunakeszi.hu/userfiles/file/winugatetojilifomo.pdfIn PDF document text
- http://akvatoria.by/UserFiles/files/13071840281.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2deda693287d164601965cf49d62e615/38055093317.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1ln8bt7iut1dqtguvsn1624s0/diruxufixadoxuz.pdfIn PDF document text
- http://airholic.com/UpFiles/WebEditorFiles/file/saxifaxexipaf.pdfIn PDF document text
- https://augsburger-dartliga.de/uploads/file/64897560907.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/88965139952.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849e808da77---81062407631.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_off0000e5fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5FB	17592 bytes
SHA-256: `fabba82d3ef19b4d4eb0963de681409aecc45c6156f079e18e4f38cc4a72c878`
`font_01_sfnt_off000113a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113A0	11092 bytes
SHA-256: `623a5b3ce929f0710b51172f707f8cfb61b7554b7234bb29df6cab94542aed1e`
`font_02_sfnt_off00012d28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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