PDF malware analysis — malicious · 53796a17f422f155

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 22:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6a6d5ef956e0f74b95ec3f93aaea0154 SHA-1: 823802444e41bffcefd8b7a1d93dacf5307d1e75 SHA-256: 53796a17f422f1558592d584f867be68f44ecb4d84a805e36b0dd47dab959c00

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to lead them to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9885

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://laborke.ru/uplcv?utm_term=singer+featherweight+100+instruction+manual PDF link annotation
- http://kondicionery-fryazino.ru/upload_picture/file/3856709435.pdfIn PDF document text
- http://ashole.hu/UserFiles/File/13006701429.pdfIn PDF document text
- http://www.niziointerior.pl/upload/file/povelifelulifisamutof.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/96368372598.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cb5d13baf7bcb3bdfbcf87bae59dfe6a/80679391208.pdfIn PDF document text
- https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/34b3aef37aaaff6077cc0386cbaa71f6/85237907036.pdfIn PDF document text
- https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/h56lupkth8aqis5athp8engf9u/vetonupotafowameduv.pdfIn PDF document text
- http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fj8fa980th1l3qj6bl0msm54k5/13542514091.pdfIn PDF document text
- http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105042218573510.pdfIn PDF document text
- http://dsfly.com/uploads/files/68049465935.pdfIn PDF document text
- http://xiaohecollege.com/d/files/54215159757.pdfIn PDF document text
- http://www.pilartangguh.com/file/fodijibuwetik.pdfIn PDF document text
- https://baptistfriends.org/media/68659967177.pdfIn PDF document text
- http://cistenivytahu.cz/upload/file/36889761754.pdfIn PDF document text
- https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05745053a3---temerokaperuzifuboruv.pdfIn PDF document text
- https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ded87e441d37eb4445ee086d14436cd7/magamazobebubitojufimaz.pdfIn PDF document text
- http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/15051548819.pdfIn PDF document text
- http://raffaelecavazzoni.com/userfiles/files/28942434271.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2546b74d9d---6676215477.pdfIn PDF document text
- http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/bunizoroligadozebi.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9014e13de---94857422398.pdfIn PDF document text
- http://lenosada.sk/editor_uploads/files/6152554296.pdfIn PDF document text
- http://zhuxintrading.com/uploads/ckfinder/files/20210823/16297102747599.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160768c613c545---23348851434.pdfIn PDF document text
- https://fultoys.com/userfiles/sujalegajabipedoritaw.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5838b60a3---fewatiniwibebenidulazo.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d4742a08---50234610931.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_off0000bbc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d3de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3DE	11216 bytes
SHA-256: `dc370abbed5c7d4f8183b681e10a1e78f2cd9da2d1e7d01e57f552fe0ee73931`
`font_02_sfnt_off0000ee08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE08	14984 bytes
SHA-256: `d29f6397367b3ee609d154b39a6817bf3ad25c9ba372614492783af2204da474`

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