PDF malware analysis — malicious · 647d98a4d232868a

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 23:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: da511ca105bdebc6606f114b1f6c5e20 SHA-1: 18bdbd857d0df943fb93548e45dfa6c4ba771e4f SHA-256: 647d98a4d232868a173066bd819faa84ed33042e242ce584d762d346da8bb3de

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://krisoc.ru/uplcv?utm_term=led+tv+schematic+diagram+download PDF link annotation
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607073dec1082---davesasonirulerevowazamaw.pdfIn PDF document text
- http://acecaalcoy.com/userfiles/file/2229850593.pdfIn PDF document text
- http://mkconline.com/landmark/ckfinder/userfiles/files/34175535435.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608421b92cf8c---85916593562.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/nppjv75cn8rmrnka1b7hfer5sh/vejidane.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a452c733aec---44848621104.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc88e4a2a---19179423564.pdfIn PDF document text
- https://mimpishiodua.com/contents//files/fosuzokodaloke.pdfIn PDF document text
- https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/15aba908cd3b01ec712cfc2279ef2e13/38388250776.pdfIn PDF document text
- https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/15f45008bb449cf1be98d9beb827e03f/xazevinokasi.pdfIn PDF document text
- https://amatnieks.com/pictures/image/jivawewisikevar.pdfIn PDF document text
- http://shinies.ru/img/lib/file/fivuramupudupa.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904a5034c9b---47180776038.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df510735---pejekokegijowemo.pdfIn PDF document text
- https://camelcarpet.org/d/files/vedimejopimezezubu.pdfIn PDF document text
- https://muratay.nl/userfiles/file/vizawuxifuf.pdfIn PDF document text
- https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9bd7b142---24126241676.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9c173dc68e2014026edc265f07dc8882/dadidofiwizivob.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/00gbicf3h4f9c5col2set3fn5k/pidiwinuf.pdfIn PDF document text
- https://stehovani-ostrava.cz/static_pages_files/file/4392583379.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37974d01---xuwex.pdfIn PDF document text
- https://amatnieks.com/pictures/image/9347133786.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e690.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE690	10924 bytes
SHA-256: `b8266f1d469560891c3703da76f1b7b764ecc19501eebcb03922a32874b46939`
`font_01_sfnt_off0000ff80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF80	2592 bytes
SHA-256: `e0deea33c91d446a274853c79ccdb1fa52818536ba0cb84db5c672eacd150f89`
`font_02_sfnt_off00010ab0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000122c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122C2	17652 bytes
SHA-256: `ec7f3c167cab5268dd77b38acf416f2afc6a2a5483ed713b4b3f42583b0f94c4`

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