PDF malware analysis — malicious · a398beb331e8adc6

MALICIOUS

PDF

71.6 KB Created: 2021-07-03 19:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 8cc1464ef4db52ce9888fab22be78b9c SHA-1: bbe90d0b1972291e677d7d953edc1d0b8d20958a SHA-256: a398beb331e8adc674c9fcaf22212c63eb94097d7626141846a029a4124d2ea2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farms strongly suggests an attempt to lead the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=professions+that+make+the+most+money PDF link annotation
- https://luminex.pl/upload/file/35349609862.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/78085d753097f45cc82a664756db27d9/wixikojisiba.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0916dd56---rulez.pdfIn PDF document text
- http://sushiloverca.com/uploads/files/64736289408.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9ac651e1fe7874f43b592750f8d41395/24950391546.pdfIn PDF document text
- http://basyapiemlak.com/yukleme_klasoru/userfiles/file/99990793254.pdfIn PDF document text
- http://bendhorseride.com/userfiles/file/dirikikevuvugiguf.pdfIn PDF document text
- http://highendschmiede.de/highendfiles/file/dejopitexonul.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608237564f6b6---kupal.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42be5f3434---gatonalojazujiviluzedon.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a158813a96---41051053639.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/654f88b01087a7da6e0e439f8d41d1e7/44600930827.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/boposaxuzidezu.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db152e16fb---27412513045.pdfIn PDF document text
- http://myblindz.com/fck_user_files/file/sanovitonesujivobaz.pdfIn PDF document text
- https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaaa19e532---voranopizudijel.pdfIn PDF document text
- http://csc021.com/userfiles/file/20210625053607_ggt7yz.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869b01596a---72962518944.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/9e576e9a0334b8d6905070610490ede3/pidolaxixogemokigoba.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0624faab---46458846697.pdfIn PDF document text
- https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a415163b22ddb931af5186ab8137307c/45904258880.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e4b01b55---16559113788.pdfIn PDF document text
- https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5ab1c1ee827fefb493c8c04caa787bec/7966956018.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/702352f8d061b190d47d26cf494c1cfe/11975652168.pdfIn PDF document text
- https://amd-export.com/site/upload/file/wejobiberixagarifaseg.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_off0000bb40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB40	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d357.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD357	10640 bytes
SHA-256: `823da233798208b8e986a3f50ea49bf48f1a267e50511cc84d3ab0c9ec374468`
`font_02_sfnt_off0000eb8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB8B	14944 bytes
SHA-256: `434af78b33adae01c32e688f5e782812781e4f7b26cfe5d56038cf2ffc67667c`

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