PDF malware analysis — malicious · 815d36dd9609582c

MALICIOUS

PDF

121.5 KB Created: 2021-06-25 14:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 49c61424d8bb52bf8931289e0fab041c SHA-1: f9219faa172d2c04b82141bd6a2f4888b9c9af2a SHA-256: 815d36dd9609582c8125cda3273cc77da3bbb12114d0072c331af99687b9b4e8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious sites, a common tactic for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607975f92ddb0---73250400768.pdf In PDF document text
- http://svsteinfurth.de/radsportfiles/file/10936981480.pdfIn PDF document text
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/d2775bae1d5a300a26c6f8bef3b01b8b/3647795961.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d528db651---58647012706.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/76e2753e70897384ddcc86e050b6b0a1/misusarezorenir.pdfIn PDF document text
- http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/kilixitagobewig.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccac105be9---99318656449.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608122405a2b4---pobinujituva.pdfIn PDF document text
- http://rszm88.com/upfolder/e/files/20210604081313.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607249a9120ae---75752809202.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe26415f1---wonisikepaxusewarigopu.pdfIn PDF document text
- http://belgium-ex.com/images/blog//file/69255553314.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2f4fee7094f9b643d8dce0deb3dc677b/poresedufofobexegapi.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9060bf1eaf---xosetokozasukudogizuta.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=diploid+definition+biologyPDF 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_off00016fba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16FBA	22324 bytes
SHA-256: `494ebe15f63049e962aa6e645de1290f7d7cc3db13c0b88a522f75386701c373`
`font_01_sfnt_off0001a89e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A89E	10496 bytes
SHA-256: `d993dbb420b4561accd41dce399c28b849f8a4129f19457179929c946dda0065`
`font_02_sfnt_off0001c022.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C022	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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