PDF malware analysis — malicious · 0a1c777fda752dc5

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 04:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 9bc18b41d9d2043f80f5e87cc572ef19 SHA-1: 6af79013d85f8cc336ef80a6b02d364356adbc94 SHA-256: 0a1c777fda752dc57bb22052d5a50e680d6e3ca0cc80ab2db063aef90de66bab

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external links and the 'callback phishing phone lure' heuristic point towards social engineering tactics to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://coretry.ru/uplcv?utm_term=lord+of+empire+kingdom+war+mod+apk PDF link annotation
- http://zussobrance.sk/grafika/dokumenty/ranuwalokenarajomikub.pdfIn PDF document text
- https://aznamaste.com/ckfinder/userfiles/files/wuvej.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613032b8d034b---nesinoxevezewe.pdfIn PDF document text
- http://skidubravy.sk/spravca/ckfinder/userfiles/files/fulipuxetag.pdfIn PDF document text
- http://jfhconsultancy.nl/userfiles/files/defotarijagabavineman.pdfIn PDF document text
- http://thaicockstar.com/ckfinder/userfiles/files/63120326062.pdfIn PDF document text
- http://naso10.com/userData/board/file/ninosudawiradafirazixibi.pdfIn PDF document text
- http://jnejendomsdrift.dk/userfiles/file/bebodimokipedogazizeniz.pdfIn PDF document text
- https://onthespothousing.com/userfiles/file/kelajufowix.pdfIn PDF document text
- http://stelmart.ru/userfiles/file/foloputu.pdfIn PDF document text
- http://systemsbiology.at/uploads/assets/file/xivinunefemoxa.pdfIn PDF document text
- https://wedding-photos.cz/userfiles/file/20274473737.pdfIn PDF document text
- http://dalieuht.com/app/webroot/uploads/files/pokeseduwewimozekiwolalu.pdfIn PDF document text
- http://otczenacts.com/media/files/nevijosipanadazes.pdfIn PDF document text
- https://auto826.com/uploads/files/39585079685.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5e941cf3e51add5ab36c984358ee88d2/joxefevuxuvuguwipejad.pdfIn PDF document text
- http://isotech.si/uporabnik/file/panowuko.pdfIn PDF document text
- http://brandiassociati.it/userfiles/file/48580682866.pdfIn PDF document text
- http://tidomusica.com/uploads/files/202109080653246025.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/setupifutevexazuterimivul.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f727a0b3b---xurafipivuz.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/fakotu.pdfIn PDF document text
- https://gagiongvitgiong.com/ckfinder/userfiles/files/91618512902.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_off0000dcd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E6	18748 bytes
SHA-256: `f689d6507c42d057b5a3b409cc1249fa7faa5357e717818dcb64d011508dc19a`
`font_02_sfnt_off000125f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125F6	10664 bytes
SHA-256: `fe9c5480c97de159bc402d5a3d915d8f6b90db3861a75db22c634f2f254fb4ba`

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