PDF malware analysis — malicious · e905ba08bab015c5

MALICIOUS

PDF

70.0 KB Created: 2021-09-04 18:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 0aae7d32cc5cfedf26e6b22eb5f7471c SHA-1: e048fbbb1d3c8579e7a2aeffdcd46befd29f995e SHA-256: e905ba08bab015c536e1fe01e2b17c99ab1c3b8b5ab50ef651944b2bed5dd547

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

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://chemicalengineers.ie/images/nujupunujobil.pdf In PDF document text
- https://ubk-sad.de/azubi/userfiles/files/48043409272.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k3k4o756ei4k7diq0b9u936aqu/nokikidoboliwoz.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8b2fb9aa3a7cd982c3fa4383b1685cc8/zafaxuxawexo.pdfIn PDF document text
- https://lifecareproduct.in/ckfinder/userfiles/files/zuzilagudowurabefite.pdfIn PDF document text
- https://atamergranit.com/userfiles/file/61218182984.pdfIn PDF document text
- http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/46769891781.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16074bfc6eeae8---28542428846.pdfIn PDF document text
- https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8025f3d2e7e22e71439e559d33d54c31/wowomedomutepokomuji.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/jujulufezo.pdfIn PDF document text
- http://www.hzkontejnery.cz/ckfinder/userfiles/files/47827288127.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fe67cfab---purivedasolurijozadi.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/tijebitilowutu.pdfIn PDF document text
- http://rbc-bezorgdiensten.nl/upload/13483512709.pdfIn PDF document text
- http://aliguoriarchitetto.eu/userfiles/files/bajudazofejixezesugi.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4269f15b---96840350462.pdfIn PDF document text
- https://resttour.com/images/userfiles/files/10024801323.pdfIn PDF document text
- http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/petanaximelofituliz.pdfIn PDF document text
- http://gachmenminhchien.com/media/ftp/file/lavikeba.pdfIn PDF document text
- https://inprovitvenezuela.com/ckfinder/userfiles/files/89909543541.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5984b3f4a---19104905130.pdfIn PDF document text
- http://transbur.ru/admin/ckfinder/userfiles/files/lexokugap.pdfIn PDF document text
- http://surtek.biz/image/files/20150115_222625.pdfIn PDF document text
- http://peak-experience-europe.com/images/blog//file/jikekerabixofovikad.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269d5508d5---bumuwuxedajom.pdfIn PDF document text
- http://studiopedrazzini.eu/userfiles/files/dopufi.pdfIn PDF document text
- https://ooobelkom.ru/ckfinder/userfiles/files/90341238761.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3551554d147c7ec645ad2b84c4630a88/zaxuje.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bloodlines+book+6+pdfPDF 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_off0000b58a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB58A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cda1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDA1	10584 bytes
SHA-256: `065d3142a10de5c991dd215783d7880db7ec9e2014dbddd06bcb9bccb0e23b52`
`font_02_sfnt_off0000e5a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A8	14628 bytes
SHA-256: `af965f20e9ad16e9db30278edf042bdc430ee7fa663aa8a7d30ae5ac6fb78653`

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