PDF malware analysis — malicious · 6150d6f16336f0ab

MALICIOUS

PDF

89.6 KB Created: 2021-10-08 01:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: bfd3eeadfc11e32e5aef053d2e079fed SHA-1: 66f2abf7f59245fc09223b77c40f10787796fcbe SHA-256: 6150d6f16336f0ab32bef77c54ee47b100707d393fe6f5c3f775b11e5bec814e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, including those pointing to compromised CMS uploads and disposable hosting, suggest a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=verify+each+identity+worksheet+answers PDF link annotation
- https://remont-bez-zabot.ru/files/file/bumanubulabulaxedekuxi.pdfIn PDF document text
- http://www.vljainandco.com/userfiles/files/betopofebubomozufexefa.pdfIn PDF document text
- http://standardamulet.com/files/files/vutukero.pdfIn PDF document text
- https://ikansambel.com/contents/files/fejategusenatona.pdfIn PDF document text
- http://brmxn.com/userfiles/file/20210910124256_forge5.pdfIn PDF document text
- http://chizclean.ru/files/fck/file/selogakukipufov.pdfIn PDF document text
- http://ptaki.info/imgekoprojekty/files/lodolegulixaduga.pdfIn PDF document text
- http://acupunctuuryao.nl/ckfinder/userfiles/files/90097856138.pdfIn PDF document text
- http://phutungtdc.com/upload/files/jazoxovorirevuveluxonane.pdfIn PDF document text
- http://bjyhyy.cn/filespath/files/20210909035101.pdfIn PDF document text
- https://woodfur.in/userfiles/file/81609158619.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d9554a33f20712d3add6a316d350bd70/58678716171.pdfIn PDF document text
- http://jingkangchem.com/upload/files/57513206008.pdfIn PDF document text
- https://clubelsendero.com/img_pag/file/8959282398.pdfIn PDF document text
- http://pro-roubenky.cz/UserFiles/File/91200551552.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/825cc9afe0a80403f6ed890c6b06dd4b/63510235110.pdfIn PDF document text
- http://krzysztofmalec.pl/gfx/fck/file/sepitoravonalir.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/39255717669.pdfIn PDF document text
- http://cokhibaosang.com/media/ftp/file/88936990644.pdfIn PDF document text
- http://pi-consulting.ch/download/surazasezomuraxowabefeju.pdfIn PDF document text
- https://kvzriu.org/images/file/xigifozurajemirep.pdfIn PDF document text
- https://themalc.org/files/file/99954035785.pdfIn PDF document text
- http://bularz-auto.pl/images/userfiles/file/55626119302.pdfIn PDF document text
- https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4a1c1d3ef7417242d56968b694f739f1/7272577432.pdfIn PDF document text
- https://madspot.dk/ckfinder/userfiles/files/fapedakazajewurevaguvalif.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_off0000f478.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF478	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010c8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C8A	18976 bytes
SHA-256: `65c88d6d9cdedd042d859cba7190703c2cc9d7daab6d7bc2da9620de5ab74cbb`
`font_02_sfnt_off00013e11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E11	10788 bytes
SHA-256: `bb642f30184260c009464414451a707e6961a033a0a96c6bad27361cdaaacffa`

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