PDF malware analysis — malicious · ddb68b2295c5f3e1

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 03:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 8d14f73fdddd2f451eb370e64d0171ad SHA-1: a592a810c80cbbab26e7f80036304d4d551ec433 SHA-256: ddb68b2295c5f3e1e4fe6b9fd1e2df228ae554af652ab841fb152d3787f88c75

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=o.s.+52+fs+engine+manual PDF link annotation
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ea40519b---3231074440.pdfIn PDF document text
- https://klairtransport.com/uploads/files/16732566531.pdfIn PDF document text
- https://magerp.org/upload/files/42550078379.pdfIn PDF document text
- http://acrclubinversores.com/files/galeria/files/wesata.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6da6b522bb949f3235ad3b57a7b6957a/89713166423.pdfIn PDF document text
- http://koszyczarek.pl/userfiles/file/18071631179.pdfIn PDF document text
- http://sakuragiramenandsushi.com/uploads/files/dakaxasobikegume.pdfIn PDF document text
- http://canvangdientu.com/images/file/nexinamelixeforexa.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44880733d2---vofer.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae92125841f---wuritilasujugejafavapabit.pdfIn PDF document text
- http://www.dogwoodagility.nl/ckfinder/userfiles/files/fulojudez.pdfIn PDF document text
- http://chenruichem.com/upload/files/kixono.pdfIn PDF document text
- https://holocaustresearch.pl/nowy/photo/file/47341936491.pdfIn PDF document text
- http://sun-dr.com/uploads/files/202109020503121488.pdfIn PDF document text
- https://myagenda.myagenda.cz/pictures/editor/files/piginuwejarimep.pdfIn PDF document text
- http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/75195176643.pdfIn PDF document text
- https://nestuby.com/userfiles/file/70345754121.pdfIn PDF document text
- http://myucmas.com/userfiles/file/xolapulafu.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/049617a0926de925442d624b419548c2/21219810273.pdfIn PDF document text
- https://schilderlesvakantie.nl/ckfinder/userfiles/files/77081727954.pdfIn PDF document text
- http://apartmaji-zunicmile.com/uporabnik/file/tagiwogusajajemexa.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fqv3tvit5cjs3t7akr289su54m/32277096251.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/d4b562b2d3fb4a27dbb5e32c599b8906/wujixagegujulanunamew.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/kulasabumokixexazokan.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_off00010c52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C52	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012469.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12469	10684 bytes
SHA-256: `6ba6b8039cd69fc44f3add8f4da9498361dbeca809a6034a4039e4063302f27f`
`font_02_sfnt_off00013cfd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CFD	20272 bytes
SHA-256: `138ab8a0ae03c4fe4c12830b8a5ff5c5a8033ac07004762f48193e0f4f2b7e83`

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