PDF malware analysis — malicious · 9850bbbcd845c257

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 14:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 417f839406eea8eac3595c578cdeae75 SHA-1: 0c88d977b569f3726c6511044f9121fec7b59a36 SHA-256: 9850bbbcd845c257fdf8e8de6c3423a89a7a522bd6ad59939f6ed4db661b5898

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://goodmax.ru/i/files/sexifirawuwamufinugake.pdf In PDF document text
- https://gberwanda.com/gbe/useruploads/blogs/files/seroremikatimebejawoz.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/809dfdd63842d800a0189e7cb60b6d71/matetu.pdfIn PDF document text
- http://turinimoti.com/assets/userfiles/file/14324717232.pdfIn PDF document text
- https://sakesushimn.com/userfiles/files/bosulinir.pdfIn PDF document text
- https://ijtm.in/userfiles/file/90756863454.pdfIn PDF document text
- https://www.vignolaweb.it/ckfinder/userfiles/files/zanuzi.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/42121c9ad98195ccfdea11f6a6937bfb/49582174886.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/91920255338.pdfIn PDF document text
- https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9a8ja74cdi9mibpt2rs19pkei7/xalevixafuzaxuse.pdfIn PDF document text
- https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/823fa054973945a299db23ff487f2271/25133746618.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/zokaronojegejavi.pdfIn PDF document text
- https://byocamacho.com/ckfinder/userfiles/files/41845714557.pdfIn PDF document text
- http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/dujafosalafowobelujewi.pdfIn PDF document text
- http://oris-am.com/editor_up/folagowogigagagavokefebav.pdfIn PDF document text
- http://tuning-zone.eu/userfiles/file/50716997170.pdfIn PDF document text
- https://pametnidom.hr/pametne_kuce/userfiles/file/demewubexukomo.pdfIn PDF document text
- https://thefertilizerequipment.com/d/files/buzibovelabinujeganikugi.pdfIn PDF document text
- https://techinnsrl.com/writable/public/userfiles/file/17877238774.pdfIn PDF document text
- http://www.europesolidaire.eu/userfiles/files/kenexojakirudu.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/weranesidajumenutireje.pdfIn PDF document text
- http://piqiso.ru/userfiles/file/57568758912.pdfIn PDF document text
- http://ikuma-car.com/js/upload/files/72041495694.pdfIn PDF document text
- http://execdentalclinic.com/uploads/ckfinder/userfiles/files/62694734257.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=papa%27s+game+unblockedPDF 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_off0000d7f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7F1	17872 bytes
SHA-256: `3cbb414d66eab9a11d0bb77c5efcac191c31aff8f8acc81472da896c7a0442e2`
`font_01_sfnt_off00010601.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10601	10936 bytes
SHA-256: `60c74fee5e100e572f5057b81eff9757a55749413fc11857302695b4d6bd94d3`
`font_02_sfnt_off00011ef9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EF9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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