PDF malware analysis — malicious · 1985a3c569f238b1

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 00:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2af735d2626cc5501b625fafe8be3aea SHA-1: ecf4a6b184ae1213d1bd98661b8a6f41326b9251 SHA-256: 1985a3c569f238b11c318ff1c4698f038817d0e89aae85097ce6db8cc0035240

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. The embedded JavaScript may be used to further obfuscate the malicious activity or facilitate the download of additional payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=clinical+microbiology+lecture+notes+pdf PDF link annotation
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c193fa0a390---latedevuliretos.pdfIn PDF document text
- http://mayinluatudong.com/uploads/userfiles/file/7262628165.pdfIn PDF document text
- https://www.aicsmindia.org/ckfinder/userfiles/files/gatuvamusemufe.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vcsko9mgj55q1s0omhjf3pl6q4/xilapidewuxuwabo.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afddf1add41---793279798.pdfIn PDF document text
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/rogekekokugodelo.pdfIn PDF document text
- http://digifast.cz/userfiles/58912947228.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3afac0df86f66bb7e0c8f74214b2c629/ziravitedovovagefadet.pdfIn PDF document text
- http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1d9a73d88d2c6af141d67329be3353ab/12501881840.pdfIn PDF document text
- http://luingpyrex.cz/foto/Image/file/25641571852.pdfIn PDF document text
- https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6eadef771ba783c66e930070d120221d/xelonefitefiw.pdfIn PDF document text
- http://pujcovnanaradi-tvarozna.cz/userfiles/files/89371181663.pdfIn PDF document text
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8446c0a6e---7660151930.pdfIn PDF document text
- http://bong-dem-long.org/upload/editor/files/14651755502.pdfIn PDF document text
- http://robalton.es/Albums/images/file///83124276524.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/09a3538a839a805b6fe189e1ed99d733/8781548066.pdfIn PDF document text
- http://escalierdurire.fr/ckfinder/userfiles/files/rekivusejebe.pdfIn PDF document text
- https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160823655d3a0d---jozimubiki.pdfIn PDF document text
- http://leicesterbiketec.com/userfiles/file/bekuwuzazibavegukojikexew.pdfIn PDF document text
- https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/a4249a9abd399f4480b90a874edd886a/zawuwavakuxubulagilason.pdfIn PDF document text
- http://hanasushipickup.com/uploads/files/zefatesufaza.pdfIn PDF document text
- https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6eflgkfen8kd185r9tnl3oddg3/71561980999.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ac1f7dbd7---mesobarat.pdfIn PDF document text
- http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a052424f119---58245280630.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_off0000f898.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF898	11348 bytes
SHA-256: `8f2c967c4ea2a409ae137c9c52c962ff7bb385ce3d9d2aa03d36a3321da51dda`
`font_01_sfnt_off000112e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112E9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012afb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AFB	18524 bytes
SHA-256: `b2be8ccd1625e4b3a9d150a4148f75690f3d77e5058eace86b9c043d4819a85b`

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