PDF malware analysis — malicious · 16533902fa952512

MALICIOUS

PDF

92.6 KB Created: 2021-08-29 15:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 96fc2cd26fd6cdb59cf445cf2c4255fe SHA-1: 292a444f408d2c53e826b648b24e89e3ee710021 SHA-256: 16533902fa9525125f5cb07717308ea4f3c6df9a5337e8bbddc94c65856edefa

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16106976a62ffd---82331841837.pdf In PDF document text
- http://amuseonline.com/absite/userfiles/file/11198060783.pdfIn PDF document text
- http://szentimresiklos.hu/upload/file/21747322890.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a725ce07---28794846648.pdfIn PDF document text
- http://cuatudongsaigon.net/uploads/files/66729829765.pdfIn PDF document text
- http://airholic.com/UpFiles/WebEditorFiles/file/74311258057.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b549932a4b---95988868436.pdfIn PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/18571cd9a25a4f49c085694c99b22d00/97508292791.pdfIn PDF document text
- http://mastera-mix.ru/ckfinder/userfiles/files/16376418365.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c642aa0b43a---diwogukilejavowedademan.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084acb0af6db---68257154268.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970fc257422---52164060429.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac550604b---vuxotilabuxami.pdfIn PDF document text
- http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9b9b8804---bejujagakuvugema.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b614895e179dde05b9d77b2459db7677/kofose.pdfIn PDF document text
- http://unesco-mediain.cz/fckfiles/file/6046379370.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b2e7ebfe2b0d977d9705cc9dc86bb434/funaleperoluzemimazit.pdfIn PDF document text
- http://beerskiboot.com/img/upload/file/78901518426.pdfIn PDF document text
- http://ankamet.com/userfiles/file/mutosug.pdfIn PDF document text
- http://vmkmsz.hu/userfiles/file/5129808881.pdfIn PDF document text
- http://ulleungroadtour.com/FileData/ckfinder/files/20210816_4581D478D6B42E6B.pdfIn PDF document text
- http://ticaproduce.com/ckfinder/userfiles/files/bobebufogusuben.pdfIn PDF document text
- http://atomleasing.ru/media/File/lovovewexisasajufozubafak.pdfIn PDF document text
- http://friend5190.xyz/js/ckfinder/userfiles/files/7610336926.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210731_E10DEB7FD811B66A.pdfIn PDF document text
- http://kleinschadenexpert.com/userfiles/file/53100399585.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mythica+a+quest+for+heroesPDF 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_off00010129.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10129	10636 bytes
SHA-256: `95aaae492dd2b2160b77a4639676423f24f8be602fbc50f09efc0173d5709dcf`
`font_01_sfnt_off000119c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C1	18584 bytes
SHA-256: `ba5f4933f2dc3cf203be4fdef67e5ee11455dfb16861f0e77b1d0c89a84790be`
`font_02_sfnt_off00014a48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14A48	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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