PDF malware analysis — malicious · ca13bca4ec3e08a6

MALICIOUS

PDF

94.9 KB Created: 2021-08-03 16:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 8de470e60ea14f49c89e981dedee98a2 SHA-1: c8a177e100dee0c6b1dcd1ed8ed509b479347233 SHA-256: ca13bca4ec3e08a60675ad660253db58c737e7342406c66686110d3c74d73bb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection vectors. The presence of compromised CMS upload links suggests an attempt to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9866

Heuristics 6

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.
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://zlato-eu.cz/upload/files/74919548777.pdf In PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5322dce2---64759705565.pdfIn PDF document text
- http://artgraf24.pl/userfiles/file/zitetolip.pdfIn PDF document text
- https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709200d32e9---4084279637.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/c91vretkippm2vh9ds02sefmvc/78923364654.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vhtkc22gdkpn1r562ejko660v0/3717022445.pdfIn PDF document text
- https://harryfok.com/ckfinder/userfiles/files/baxexixas.pdfIn PDF document text
- http://phelieuviethung.vn/upload/files/60312096134.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d94009d700---27361181830.pdfIn PDF document text
- https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160faf63d16535---13510432217.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/9a222900f5850ae7e6b4d1006f564acf/peboxadekebejenafapagov.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/67877497202.pdfIn PDF document text
- http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840e9cd0d8---xetigotedirewurapekidupob.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5d3dad65---bupafavumolofabavutupi.pdfIn PDF document text
- http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b723e971---29693744628.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90c17464f---sutukugeb.pdfIn PDF document text
- https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/98a8801d0b72b8d23090abbaefdf3d13/1641458484.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/labufopudinidusabobekutem.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/el5tmhaldnn3puhvo3usvo01r3/diweza.pdfIn PDF document text
- http://maslatalaia.com/userfiles/file/55838618605.pdfIn PDF document text
- http://atomiccm.com/userfiles/files/55725264883.pdfIn PDF document text
- http://chickendaylacrescenta.com/uploads/files/nirezovirikubemoxazaluj.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4bk6iokcr39lt1mqbc1g7qadv0/73182229942.pdfIn PDF document text
- http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/71125451612.pdfIn PDF document text
- http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581bf15c7b---89463214045.pdfIn PDF document text
- https://srmresidences.com/images/bulk_images/files/sosazuvoxedokujuvevax.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=frontline+commando+2+full+game+downloadPDF 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_off00010cde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDE	17708 bytes
SHA-256: `2c8be2cfcd20854ed625a09d80c529afd4b0b29e42efbd8313a0dcf5626aade7`
`font_01_sfnt_off00013af7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13AF7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001530e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1530E	10932 bytes
SHA-256: `d11a6ce6289103d45d15f46b45263d9b3636f9354064a94ce8b5594518c13c02`

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