PDF malware analysis — malicious · 79fe820fed174ae3

MALICIOUS

PDF

94.7 KB Created: 2021-09-04 14:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 842b04b3ff59090959fdf09f89cfbc33 SHA-1: fb598e9a4120c963fa7d69d4ce20e5072ca51ba8 SHA-256: 79fe820fed174ae30d038363578cf246e7fb8d81a57edab24bc8a2937ddee317

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

Heuristics 7

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.
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://alpanelektrik.com/depo/sayfaresim/file/6286424057.pdf In PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83574835---mojewatefepuxor.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00b12513c7---dezegogalu.pdfIn PDF document text
- http://gourmethousemacau.com/UploadFilesfile///lanerevuwuxepisirifuk.pdfIn PDF document text
- http://hanasushipickup.com/uploads/files/bepusumizapixopifumitunin.pdfIn PDF document text
- http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/sipejemerijolata.pdfIn PDF document text
- https://boumqueur-edition.com/upload/fckeditor/file/80216353802.pdfIn PDF document text
- http://ipceurope.com/assets/file/kirupewijapujasipowavag.pdfIn PDF document text
- https://mirrorlink.com/public/files/files/21226741445.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/34157330369.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i07i25bos9ccnlvja8olkbik6/19967195205.pdfIn PDF document text
- https://autoteam.in/ckfinder/userfiles/files/rolumiduza.pdfIn PDF document text
- http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/retupujivenegasepenume.pdfIn PDF document text
- http://opusincertum.it/userfiles/files/xowowu.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0df17c3e41---gebalisunezafe.pdfIn PDF document text
- http://phuongdonggolf.vn/app/webroot/uploads/files/23963210356.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84214da33a---5046877500.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8hlk3chgk3dl6ia0qcke1np8tb/1843484875.pdfIn PDF document text
- https://bharatceramics.in/ckfinder/userfiles/files/bidunagukimop.pdfIn PDF document text
- https://bataretak.com/img/files/file/dizesumavenegukiwexegedi.pdfIn PDF document text
- https://uangraja.com/contents//files/89715535229.pdfIn PDF document text
- https://www.pirkitpadangas.lt/ckfinder/userfiles/files/sodobokeja.pdfIn PDF document text
- http://sumbulefendiegitimvakfi.com/resimler/files/wejasa.pdfIn PDF document text
- http://rubivina.com/Images_upload/files/gututunikadipije.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c579b86dfcc---xixoto.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c9db14744cca33c62f2eb8c8b0ab9be7/bujipil.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2dcfef141---31198427233.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2012+bad+boy+buggy+xto+owners+manualPDF 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_off00010b06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B06	11236 bytes
SHA-256: `c968b0cbe291f4454aefff08735d538806a4ba3466be81ec1c9efdbed78f6532`
`font_01_sfnt_off0001254f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1254F	18368 bytes
SHA-256: `91675e921dfb807a91318fd0e8a73b2aa3ff70caaa8a5b7c0e9d1ba8a9056e2e`
`font_02_sfnt_off000154f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x154F3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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