PDF malware analysis — malicious · 9d910103b64543f5

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 05:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8a6237c7b4e8657e9db66142ac57881c SHA-1: b3037d6e77844041a1d367a936ad71d5b8391468 SHA-256: 9d910103b64543f5d4c1684bee81d7d079d9a5815bee935aa28a3b8328ac407e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://ajtoablakcentrum.com/_user/file/kilegowisiwuxolakumat.pdf In PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/063suostn5gdgtihtf59pd4hkl/62677400219.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613464fd0a4c2---vovarividigurenobaz.pdfIn PDF document text
- http://plafondchauffant.fr/img/user/file/9726529724.pdfIn PDF document text
- http://avvocatoandreabruschi.it/userfiles/files/wofumobapibe.pdfIn PDF document text
- http://magiepourenfants.com/images/mediamanager/file/9348206556.pdfIn PDF document text
- http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewilodibixubope.pdfIn PDF document text
- https://numen-wow.com/userfiles/cloud/files/31185792827.pdfIn PDF document text
- https://psg66.ru/admin/ckfinder/userfiles/files/labewuwebulo.pdfIn PDF document text
- http://mexxeopaint.com/upload/files/61847291620.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/talonadimukanat.pdfIn PDF document text
- http://www.moyekolodin.com/files/wesolumutepixikadisejup.pdfIn PDF document text
- http://cabanagarden.hu/editor_up/mejuxelusadefepowixezaz.pdfIn PDF document text
- http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/34580831646.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354aaa75350---91589847290.pdfIn PDF document text
- http://cn-daomeng.com/upload/userfiles/files/87c7a5a8acb8258cfc09232af651729d.pdfIn PDF document text
- https://hogozaty.com/ckfinder/userfiles/files/8551100079.pdfIn PDF document text
- http://gyogytornasziget.hu/uploads/files/faxobibutajozufagowuxusi.pdfIn PDF document text
- http://romovi.net/sgi_userfiles/userfiles/files/tasomixipigojorowozekuwa.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ef93n45o8hf2i58rotdtkg8hn2/32633755494.pdfIn PDF document text
- http://stroyindustry.com/userfiles/file/xozofutudafekew.pdfIn PDF document text
- http://herbwaterthailand.com/userfiles/files/72461279846.pdfIn PDF document text
- http://mpti.ru/userfiles/file/59377408088.pdfIn PDF document text
- http://stlnsk.ru/uploads/file/jajuz.pdfIn PDF document text
- https://jpjplumbingandheating.com/FCKeditor/file/nubuduwonotasipusevula.pdfIn PDF document text
- http://karlsbach.de/userfiles/files/39446235344.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gboard+vs+swiftkeyPDF 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_off0000e525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE525	10732 bytes
SHA-256: `42f34063c29e13a1f35dc517074201af21977f511dbe351e9c03cd4bae88284b`
`font_01_sfnt_off0000fe16.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE16	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011628.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11628	18056 bytes
SHA-256: `c887696c820e935a5d71639e3627d30ae4a33ea1d163e570df54882f755a2ed0`

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