PDF malware analysis — malicious · c431b4031ecaade1

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 06:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7bcbc636fe309a22cdc5b8dae88ce5cc SHA-1: 9d83709c1b5ce42b5e6cd430040d226a09cbe89e SHA-256: c431b4031ecaade1a55898455b6b4736c3df5c4aa38850fd1f246105cfe6d4f4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised websites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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 https://garglob.ru/uplcv?utm_term=how+do+you+record+a+phone+call+on+an+android+phone PDF link annotation
- http://nepodoshlo.kz/ckfinder/userfiles/files/mutivoxuxugibazajirage.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a98705f---bavoraboseruwoduzilez.pdfIn PDF document text
- https://unicon-msk.ru/data/files/juvujusixonogumod.pdfIn PDF document text
- http://westpakusa.com/phpsites/vertical_living/uploads/file/nefutupigilekizikeripiber.pdfIn PDF document text
- http://daithanhnam.com/upload/files/49620377345.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613320ec0db86---jebikuvaboruduv.pdfIn PDF document text
- https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/49123510862.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142781aa0761---gesosuzobigajatetev.pdfIn PDF document text
- http://praguynakorn.com/praguynakorn/picture/datapro/files/85390283356.pdfIn PDF document text
- http://arkystudio.eu/userfiles/files/bajotakelavojeguzo.pdfIn PDF document text
- http://astorandblack.net/emailer/userfiles/file/sufagumudebenewefe.pdfIn PDF document text
- https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/92507658330.pdfIn PDF document text
- http://bolshunoff.ru/images/wysiwyg/file/weduraforanepipedi.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc281c4b---25561073926.pdfIn PDF document text
- https://blugarden.eu/file/36708545857.pdfIn PDF document text
- http://1night2day.com/ckupload/files/kigirebopevo.pdfIn PDF document text
- https://keluargamimpi2.com/contents/files/48417040005.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_off0000eaf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAF9	10636 bytes
SHA-256: `91256cedddbf4f4c22927873ec2347b116601913e2b75ebcf142a59141e0d8f9`
`font_01_sfnt_off0001032a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1032A	17164 bytes
SHA-256: `ed37f5fa226965dde5ffad3f653cd1fa09f9982cdb722eee675f85ec86754024`
`font_02_sfnt_off00012f87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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