PDF malware analysis — malicious · d58aabaa22acbba4

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 02:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: eb402e943a7a27916e2f49e1457fe4d1 SHA-1: 6e3c1545ebf0aac9a0777a07b529514c9f8eca0a SHA-256: d58aabaa22acbba4640eb61cfab335abc4f8c9014e86107fda47aa73d39c2573

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites and serve as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the final destination and potentially track user engagement with the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 https://cructi.ru/uplcv?utm_term=trs+coral+hotel+costa+mujeres PDF link annotation
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ce99011adbb1d07ccb24b746cebb3b8f/fowodu.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/cadf9bd2d385b00eda5ddda7f04bcc81/xafimewazozazet.pdfIn PDF document text
- http://bjjiffy.com/upload/5464981685.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/4946708703.pdfIn PDF document text
- http://mdbim.pl/ubezpiecz/obrazy/file/58752003257.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfda4f06619---12544648269.pdfIn PDF document text
- http://rymwid-training.com/userfiles/file/lilivixojex.pdfIn PDF document text
- https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/vavg2babv65aq0ve1a70gempsc/gifegir.pdfIn PDF document text
- http://thoitrangvabaoho.com/Images_upload/files/66454211718.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a788d248659---natejuz.pdfIn PDF document text
- http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074b59666379---banagizakelozeporarizoz.pdfIn PDF document text
- http://brlairport.com/images/file/subusorutovikexob.pdfIn PDF document text
- https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/acr19a7fdmnc0e814cl3k6cnji/javuzaju.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/mazuninetigexadoda.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd90df522---40648456738.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6b2ef4390921e7dd5691d92d8de4ac1f/donovobepefexisat.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/kojanijuku.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4fc5104d---geribujiwob.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6c838905d---suredodabufadokifezenewer.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d977c463---37971966433.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/sdkgu1r55b8rcnuq6p06vib52s/22520356779.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3240a5a778acbadd820a3b69c56f9b05/42896974637.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1720ae383---sabazikifavuvamuxilap.pdfIn PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b0d93d9f3cee66896019c7a41f7ed023/rufebesejaze.pdfIn PDF document text
- http://burelomdo.com/ckfinder/userfiles/files/93503531443.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/sagigexobobofolugerom.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_off0000e997.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE997	10492 bytes
SHA-256: `c49ff3a757104846ed432d34f754c7ac67d2d33f75a303ec644b56039449fcc0`
`font_01_sfnt_off0001018b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1018B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001199d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1199D	18888 bytes
SHA-256: `a1602a97da45c4be3a9cbbc292ae91f06cf70f6b3d94c20d9593e2e2d696ed59`

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